Learn more about Castle Island, Pleasure Bay, M Street Beach, and Carson Beach

Read about the history of the site and details about visiting the park.

History of Castle Island and visitor information

fort independence aerial view

Fort Independence, a pentagonal five-bastioned, granite fort built between 1834 and 1851 is the dominating feature of Castle Island. The site had been used for other forts since 1623. Fort Independence was under federal control and used by the military during World War I and World War II. Fort Independence and Castle Island are on the State and National Registers of Historic Places. The 22-acre urban park is connected to the mainland by both walkways and roads.

Visitor Information

Fort Independence is open from Memorial Day to Columbus Day, hours vary.

The Castle Island Association sponsors free scenic tours of Fort Independence at Castle Island, weather permitting. 

June and July
Saturday and Sunday- Noon to 3:00pm
Thursday- Twilight skyline viewing 7:00pm to dusk

Saturday and Sunday- Noon to 3:00pm

September - October
Sundays only- Noon to 3:00pm (ending Columbus Day weekend)

Holiday Day Weekend: Saturday, Sunday & Monday, October 7-9

Fort Independence is handicap accessible only on the first floor.

Pleasure Bay, M Street Beach, and Carson Beach recreation

beach with Boston skyline in background

Pleasure Bay, the M Street Beach and Carson Beach form a three mile stretch of parkland along the South Boston shoreline of Dorchester Bay.

Carson Beach offers some beautiful views and great public amenities:

Carson Beach also features a walkway which allows one to walk, bike, or run along the water's edge from Castle Island to the Kennedy Library. The Boston Harborwalk, which spans most of the city's waterfront, is accessible from the park. 

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