Once a place of exile, a prisoner-of-war camp, and an internment site for Native Americans, Deer Island has transformed into one of Boston’s most scenic and significant coastal destinations. Located at the entrance of Boston Harbor, this eco-friendly peninsula offers stunning skyline views, waterfront trails, and a glimpse into one of the world’s most advanced wastewater treatment facilities.

Today, the 60-acre Deer Island Park is a haven for hikers, cyclists, and photographers, with 5 miles of walking trails along rocky shorelines, rolling hills, and panoramic harbor vistas. But beyond its natural beauty, Deer Island plays a crucial role in protecting Boston’s water quality—home to the Deer Island Wastewater Treatment Plant, a $3.8 billion engineering feat that treats millions of gallons of water daily, restoring the health of Boston Harbor.

History buffs can also explore interpretive plaques detailing the island’s past, including its tragic role as a forced internment site for Native Americans during King Philip’s War in 1675 and its use as a prisoner-of-war camp during the American Revolution. Whether you’re here for outdoor recreation, history, or an awe-inspiring view of the city, Deer Island is a hidden gem blending nature, history, and environmental innovation.