Help with vegetation management and site improvements at Sutro Heights and along the San Francisco shoreline.

Help with vegetation management and site improvements at Sutro Heights and along the San Francisco shoreline.

Help with vegetation management and site improvements at Sutro Heights and along the San Francisco shoreline.

Help restore and protect critical natural areas from the Marin Headlands to Bolinas Ridge.

Help restore and protect critical natural areas from the Marin Headlands to Bolinas Ridge.

Hiking with a mission – help find and remove new infestations of invasive weeds while exploring the parks.

Hiking with a mission – help find and remove new infestations of invasive weeds while exploring the parks.

Become a Park Steward and help protect endangered species and restore sensitive habitat in Marin.

In this webinar, former National Park Ranger and historian John Martini will focus not just on the island’s infamous history as a federal penitentiary, which operated from 1934 to 1963, but also its lesser-known roles as a Civil War fortress, a political prison for Confederate sympathizers, and a military prison for recalcitrant U.S. Army soldiers and Native American warriors.

Just a stone’s toss from Fort Mason, join us for a special tour of the interactive exhibits of the Maritime Museum at the San Francisco National Historical Park.