THE BUILDING OF Castillo de San Marcos
Reading edition
by ALBERT C. MANUCY Historian Castillo de San Marcos National Monument

National Park Service Interpretive Series History No. 1
UNITED STATES GOVERNMENT PRINTING OFFICE WASHINGTON

CASTILLO DE SAN MARCOS, OLDEST EXISTING MASONRY FORT IN THE UNITED STATES, IS A TYPICAL EUROPEAN FORTIFICATION OF THE LATE 1600’S. IT OVERLOOKS THE ENTRANCE TO ST. AUGUSTINE HARBOR, AND FROM ITS WATCHTOWER THE SENTRIES LOOKED OUT OVER THE MIGHTY ATLANTIC TOWARD THE TREASURE FLEETS ON THEIR WAY TO SPAIN.