Fort Independence at Castle Island

Fort Independence is a granite coastal fortification on Castle Island whose current structure dates to the mid-19th century and was built on the site of earlier colonial and Revolutionary War-era defenses. The fort served as an active military post through the 19th century and is preserved as a historic site open to the public seasonally. Castle Island and the fort are prominent elements of South Boston recreational and maritime lore, with longstanding public access and interpretive signage about the site's military history.