"Cannon Firing" by NPS Photo , public domain
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Castillo de San Marcos
National Park Service
U.S. Department of the Interior
Castillo de San Marcos
National Monument
Florida
San Agustin
Bastion
San Carlos
Bastion
San Pedro
Bastion
Plaza de Armas
Use this exploded birdseye view to help you
find your way as you
explore over 300 years
of Florida history. The
layout that Spanish
engineer Ignacio Daza
created for the Castillo
de San Marcos is simple
and straightforward. This fortress is a hollow square with diamond-shaped bastions
at each corner, with only one way in or out.
In the bombproof storerooms that surround
the central Plaza de Armas you will find
Hours of Operation
The park is open every day except Dec. 25 from
8:45 a.m. to 4:45 p.m. The main parking lot closes
at 5:30 p.m.
San Pablo
Bastion
museums highlighting various chapters of
the fort’s long history. A good place to
start is the corner rooms next to the well.
Restrooms are located under the arched
stairway leading to the gundeck. After you
finish exploring the rooms below, make
your way up the stairs and gaze out upon
the waters of Matanzas Bay. From this com
manding position, a garrison of Spanish
troops safeguarded St. Augustine during
the turbulent colonial era. Later English and
then American troops also saw service here.
All stood watch faithfully over the land
Juan Ponce de León named, “La Florida.”
For a Safe Visit
Although the Castillo is over 300 years old, most
of the damage to it has resulted not from past
battles or sieges but from thousands of people
each year. The fort is constructed of a unique
sedimentary rock called Coquina, which, despite
its obvious strength, is very fragile and susceptible to wear. • Please do not climb on the walls
or sit on the stone surfaces. Also do not climb
or sit on the cannon. • Always watch your step.
Be careful of irregular steps, low walls with no
railings, and loose, uneven surfaces. • Supervise
children closely.
Entrance
For more information
Castillo de San Marcos National Monument
1 S. Castillo Dr.
St. Augustine, FL 32084
904-829-6506
www.nps.gov/casa
Ravelin
Shot Furnace
Guard Rooms
Plaza de Armas
Well
Powder Magazine
Storage Rooms
Chapel
British Room
A Guide to the Castillo
Shot Furnace
The U.S. Army filled in the east side of the moat
in 1842–44 and mounted sea coast artillery pieces
along the seawall. The shot furnace heated cannonballs until red hot. This hot shot was then
fired at an enemy’s wooden ships to set them
afire.
Powder Magazine, 1675–87
This was the only vaulted chamber completed
when the Castillo was built (the rest were added
during a later modernization). Its thick coquina
walls were buried in the earth fill of San Carlos
Bastion to protect the fort’s gunpowder from
fire or enemy shot. Lack of ventilation, however,
made it too damp in the small room to store powder. When larger, better vaults were built, the
powder was moved and this room was used for
other things.
Chapel
Religion was important in Spanish daily life. In
this chapel a priest conducted mass for the soldiers. With the introduction of Christianity to
the Indians in this area, various missions were
established north and west of St. Augustine. The
Spanish set up Florida’s mission system over 100
years before they set up missions in the American West.
British Room, 1763–84
British troops moved to St. Augustine after Spain
ceded Florida to Great Britain in exchange for
Moat
Covered Way
the fortified harbor and city of La Habana, Cuba,
in 1763. Wooden second floors, like the one reconstructed in this casemate, were built in the
high Spanish vaults to provide more space for
quarters and supplies. British rule lasted for 21
years. Florida was returned to Spain at the close
of the American Revolution in 1783.
Plaza de Armas and Storage Rooms
Despite their prison-like appearance, the rooms
around the Plaza de Armas, or central courtyard,
were storage areas. Here the Spanish stockpiled
gunpowder, ammunition, weapons, lumber, tools,
and food like dried beans, rice, flour, and corn.
Since St. Augustine was not self-sufficient, such
stockpiles of food and ammunition were an
important part of the town’s defense during a
siege.
Guard Rooms
St. Augustine was a garrison town or presidio,
and no one lived inside the Castillo. The soldiers
lived in town with their families and came to the
fort to stand a rotating guard duty (usually 24
hours). At such times, they slept and prepared
their meals in these rooms. The large fireplaces
offered warmth on chilly days and provided an
area for cooking. The platforms attached to the
walls served as beds for the soldiers.
Ravelin
This triangular outer work shielded the fort’s only
entrance from enemy fire. It was never finished
as planned. If completed, the outer wall would
have been five feet higher, with embrasures for
cannon and a powder magazine. The drawbridge
here and the main drawbridge are both working reconstructions. The ravelin bridge would
have been secured each night at sunset; the main
bridge was secured only when the fort was under
attack.
Moat/Glacis/Covered Way
The Spanish kept the moat dry and, during sieges,
used it as a pen for domestic animals. Whenever
the fort was under land attack, the moat could
be filled with sea water by opening flood gates
on the seawall. Around the outside of the fort is
a man-made slope called a glacis. This embank
ment shielded and protected the lower fort walls
from enemy cannon fire. The area between the
glacis and the moat is called the covered (covert)
way. This allowed soldiers to leave the fort and
still be covered or protected by this wall.
Bastions
Each of the fort’s four corners is protected by a
diamond-shaped bastion. Cannons in one bastion
were positioned to create a deadly crossfire with
those in two other bastions. The bastions’ thick
stone walls were packed solid with rubble and
sand to support the immense weight of the
cannon.
Glacis
Cubo and
Rosario Lines
Cubo and Rosario Lines
After the British burned St. Augustine during the
siege of 1702, the Spanish surrounded the town
with a wall made of earth and palm logs, and a
wide, shallow moat. The only entrance was from
the north through City Gate. A portion of this
wall, the Cubo Line, has been recovered on the
park grounds.
Well
Three shallow wells in the Plaza de Armas provided water for the garrison. One of the wells
still exists. Fresh water lies six to eight feet below
the surface.
ILLUSTRATION BASED ON ORIGINAL
BY NPS / L. KENNETH TOWNSEND
Outpost of Empire
When the British attacked
St. Augustine in summer
1740, they expected a
quick and easy victory.
They underestimated the
strength of the Castillo de
San Marcos and the cour
age of its Spanish defend
ers, some of whom are
shown here responding
to enemy artillery fire from
across Matanzas Bay.
After besieging the town
for 38 days the British
gave up and returned to
Georgia.
ILLUSTRATIONS BASED ON ORIGINALS
BY NPS / L. KENNETH TOWNSEND
Rammer (Atacador)
Worm (Sacatrapos)
Sponge (Lanada)
Ladle (Cuchara)
The roots of the Castillo’s history reach back
to the years just after Christopher Colum
bus’s final transatlantic voyage, when conquistadores carved out a vast and wealthy
overseas empire for Spain, first in the Car
ibbean and then on the mainlands of Mexico,
Central America, Colombia, Venezuela, and
Peru. Products of these tropical and mountainous territories brought high prices on
the Continent, and Spanish galleons sailed
home laden with exotic dyes, sugar, tobacco,
chocolate, pearls, hardwoods, and silver
and gold. These so-called “treasure fleets”
made Spain the most powerful and envied
nation in Renaissance Europe.
Thanks to the travels of Ponce de León in
1513, Spanish navigators knew that the best
return route from Spain’s rich Caribbean pos
sessions was along the Gulf Stream, through
the Bahama Channel, and past the shores
of Florida. The Spanish knew they must
defend this peninsula to prevent enemies
from using its harbors as havens from which
to raid the passing treasure fleets.
In 1513 Spain claimed Florida through the
expedition of Ponce de León, but France
gained the first foothold there by establishing Fort Caroline on the St. Johns River
in 1564. Seeing this as both a challenge to
Spain’s claims and a menace to the treasure
fleets, King Philip II sent an expedition under
Don Pedro Menéndez de Avilés to eliminate
the French threat and establish settlements
in Florida. It arrived at the mouth of the
St. Johns River in September 1565.
After attempting unsuccessfully to board the
French ships anchored there, Menéndez
sailed to a harbor farther south and established St. Augustine as a base for further
operations. Almost immediately a French
fleet sailed south to attack. But the ships
were driven southward and wrecked by a
violent storm and the mission failed. Re
alizing that Fort Caroline would be lightly
guarded, the Spaniards marched north,
captured the fort, and executed most of
the inhabitants. The same fate befell survivors from the French fleet, whom the Span-
iards captured and killed at an inlet 14 miles
south of St. Augustine. The episode gave a
name to the area: Matanzas, Spanish for
“slaughters.”
Spain’s New World Sea Routes
England became Spain’s next contender for
Florida. The Spanish had watched the English
warily ever since Sir Francis Drake attacked
and burned St. Augustine in 1586. They
became even more watchful after English
men settled Jamestown in 1607. British
pirates sacked St. Augustine again in 1668,
and this hit-and-run attack, followed by the
English settlement of Charleston in 1670,
caused Spain to build the Castillo de San
Marcos.
Begun in 1672 and completed by 1695, the
Castillo replaced nine successive wooden
fortifications that had protected St. Augus
tine since its founding. The fort’s commanding location on the west bank of Matanzas
Bay allowed its guns to protect not only
the harbor entrance but the ground to the
north against a land attack.
The Castillo’s baptism of fire came in 1702
during the War of the Spanish Succession,
when the English occupied St. Augustine
and unsuccessfully besieged the fort for 50
days. The English burned the town before
they left, but the Castillo emerged unscathed,
thereby making it a symbolic link between
the old St. Augustine of 1565 and the new
city that rose from the ashes.
Like a menacing dagger,
the Florida peninsula
thrusts toward the heart
of Spain’s New World
wealth. Richly laden
Spanish galleons, sailing
in convoy for protection
against freebooters, en
emy warships, and priva
teers, followed wind and
current in a great circle
route from Spain west
ward to Caribbean ports,
then northward from La
Habana past Florida and
eastward to home. To the
Spanish, the French colo
ny of Fort Caroline on the
St. Johns River was a nest
of pirates and a threat
to the treasure fleets. In
1565 they destroyed it
and established their own
colony—St. Augustine—
making Florida a haven
rather than a menace.
16th Century
17th Century
18th Century
1513 Sailing from Puerto
Rico, Spanish claim
Florida.
1672 Ground is broken
on October 2 for Castillo
de San Marcos.
1565 Spanish found St.
Augustine and destroy
French at Fort Caroline
and Matanzas Inlet.
1695 Castillo de San
Marcos (curtain walls,
bastions, living quarters,
moat, ravelin, and seawall) is finished in
August.
1702 War of the Spanish
Succession pits Spain and
France against Austria,
Great Britain, and others.
Carolinians occupy and
burn St. Augustine but
the Castillo successfully
resists their siege.
1740 St. Augustine successfully endures siege
by British, Georgian, and
South Carolinian forces.
1740–42 Fort Matanzas
is built to block southern
approach to St. Augustine.
Coastal Georgia missions
are destroyed by Carolin
ians en route to St.
Augustine.
1738 Spanish governor
at St. Augustine grants
freedom to runaway
British slaves. Black families settle at new town
called Fort Mose.
Spanish attack and defeat British Highland
troops camped at Fort
Mose.
1756–62 Fort Mose re
built in masonry. Earth
works at Mose extended
to complete northernmost defense.
tion over a vast geographical region. The
town’s principal value,
though, was as a military
base for the protection
This map, drawn in 1764,
shows St. Augustine the
year after Great Britain
took control of Florida. It
is based upon the surveys
of Juan de Solis, a long
time resident of the
town. Right: St. Augus
tine’s founder, Don Pedro
Menéndez de Avilés.
of Spain’s colonial
trade and commerce.
Spain held Florida until 1821, when serious
Spanish-American tensions led to its cession
to the United States. The Americans re
named the Castillo Fort Marion and used it
to house Indian prisoners during the Seminole War of 1835–42. Confederate troops
occupied it briefly during the Civil War and
Indians captured in western military campaigns were held there later on. It was last
used during the Spanish-American War as
a military prison.
Linstock (Botafuego)
The key dates at right,
arranged by century, are
important to the story
of the development of
the Castillo de San Marcos, whose coquina walls
are silent reminders of
Spain’s contributions to
Florida and U.S. history.
St. Augustine
In 1763, as an outcome of the Seven Years’
(French and Indian) War, Spain ceded Florida
to Great Britain in return for La Habana,
Cuba. The British garrisoned Matanzas and
strengthened the Castillo, holding the two
forts through the American Revolution. The
Treaty of Paris of 1783, which ended the
war, returned Florida to Spain.
Right: Artilleryman, Cas
tillo de San Marcos, 1740
garrison
Castillo Timeline
Established in 1565 by
Don Pedro Menéndez
de Avilés, St. Augustine
is the oldest permanent
European settlement
in the continental United
States. For 235 years it
was the political, military, and religious capital of the Province of
Florida from which
Spain exercised jurisdic-
To strengthen the defenses, the Spanish
erected new earthwork lines on the north
and west sides of St. Augustine, thus making
it a walled city. Matanzas Inlet, however,
was still unfortified when Gen. James Ogle
thorpe’s British troops from Fort Frederica
in Georgia attacked St. Augustine in 1740.
Again the Castillo was besieged and Matanzas Inlet blockaded. But the Spanish did
not waver during the 27-day British bombardment. The attack also taught the Spanish the strategic value of Matanzas Inlet
and the need for a strong outpost there.
Consequently, in 1742, they completed the
present coquina tower.
1763 Peace of Paris gives
Florida to Great Britain in
exchange for La Habana.
Castillo becomes known
as Fort St. Mark.
19th Century
20th Century
1821 Spain cedes Florida
to the United States.
1924 Fort Marion and
Fort Matanzas are proclaimed national monuments.
1935 National Park
Service begins exclusive
administration of both
national monuments.
1933 Fort Marion and
Fort Matanzas are transferred from the War
Department to the National Park Service.
1942 Original name—
Castillo de San Marcos—
is restored.
1825 Castillo de San
Marcos renamed Fort
Marion.
1783 Peace of Paris recognizes independence
of the United States and
returns Florida to Spain.
St. Augustine is also
perhaps the earliest ex
ample of community
planning within the con
tinental United States.
This is exemplified by
its regular and narrow
streets, a pleasant central plaza, abundant
open spaces, beautiful
patios and gardens, im
pressive government
and religious buildings,
and comfortable homes
—all suggesting an em
phasis on the development of an orderly,
dignified, healthy, and
pleasant environment.
The character of the city
still reflects its vibrant
Spanish heritage.
Right: The oldest house in
St. Augustine, dating from
the early 1700s.
ABOVE AND RIGHT—LIBRARY OF CONGRESS
✩GPO:20xx—xxx-xxx/xxxxx Reprint 20xx
Printed on recycled paper.
FLORIDA DEPARTMENT OF COMMERCE
NPS
Castillo de San Marcos
was for many years the
northernmost outpost
of Spain’s vast New
World empire. It is the
oldest masonry fort and
the best-preserved example of a Spanish colonial fortification in the
continental United States. It
anchored East Florida’s defenses, which extended northward to the St. Marys River,
westward to the St. Johns, and southward
to Fort Matanzas. It protected St. Augustine
from pirate raids and from Spain’s major
rival, Great Britain, during a time when the
Florida-Georgia-Carolina coastline was an
explosive international battleground.