Castle Island is a beloved South Boston peninsula crowned by Fort Independence, a granite, five-bastioned fort completed in the mid-19th century on a site fortified since the 1630s. Now connected to the mainland, the island offers a flat, scenic loop walk with panoramic views of Boston Harbor, passing planes on approach to Logan Airport, and the open Atlantic. It is one of the city’s classic spots for a waterfront stroll.
Fort Independence is one of the oldest continuously fortified sites of English origin in the United States, and seasonal volunteer-led tours interpret its history. The surrounding park connects to Pleasure Bay, a sheltered lagoon ringed by a causeway walkway, plus the M Street and Carson beaches. A popular seasonal snack bar near the parking area is a longtime local fixture, making Castle Island a favorite for families, walkers, and anglers.
Good to know
- Free to visit; the park and waterfront loop are open to the public year-round
- Fort Independence interior access is via seasonal guided tours run by volunteers; check schedules in advance
- Free parking is available on site but fills quickly on warm weekends
- Connects on foot to Pleasure Bay, M Street Beach, and Carson Beach
Getting there
- Address: 2010 William J. Day Boulevard, South Boston, Boston, MA 02127
- Neighborhood: South Boston
- Nearest T: JFK/UMass (MBTA Red Line) is the nearest rapid-transit stop but is over a mile away; MBTA bus route 11 (from Broadway station) runs closest. Check mbta.com for current routing.