The fort’s massive walls were 14 to 19 feet thick and constructed of limestone and seashells that absorbed cannon fire from besieging enemies. Although the fort changed hands between the Spanish, English, and finally the Americans, it never fell by force and withstood two month-long sieges by the English in the 1700s.
Today the fort is a national monument. Give it a visit the next time you’re in the area.
Travel safe. Have fun.