Obscura Society SF: Expedition Into the Marin Headland Bunkers - Atlas Obscura
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Marin Headlands, California

Obscura Society SF: Expedition Into the Marin Headland Bunkers

Join historian John Martini for a look inside the labyrinthine tunnels inside the hills of the Marin Headlands

**Please note time correction. This tour is at 7pm**

Join us for a special exploration to - and into - the historic bunkers at the Marin Headlands with historian and local expert John Martini.

This two mile-long walk starts at sunset at Rodeo Beach at Fort Cronkhite, then proceeds uphill (steep uphill!) to the cavernous underground fortification called Battery Townsley. Constructed on the eve of World War II, it once mounted battleship-size guns capable of hitting an enemy ship 25 miles away. We’ll explore the now-empty gunrooms by flashlight then, by special arrangement, we’ll be guided through the labyrinthine underground rooms that housed ammunition, generators, and living quarters. We’ll then return via a long loop walk passing the Marine Mammal Center and the wooden barracks buildings of Fort Cronkhite.

Guiding us on our exploration will be retired National Parks Ranger, historian, historical preservationist, author and lecturer John A. Martini. Mr. Martini is a 4th generation San Franciscan and has worked across the American West but his professional focus is primarily on this incredible city we call home.


  • April 16, 7-9pm
  • Meet at the trailhead at the base of the hill at the end of Rodeo Beach at Fort Cronkhite.
  • Tour starts promptly at 7. Please allow enough time for parking
  • Wear comfortable shoes for walking, and dress in layers suitable for the changeable weather at the coast
  • This is a walking tour, including some uneven terrain, and may not be suitable for people with mobility issues
  • Parking is available at Rodeo Beach at Fort Cronkhite

Space is limited. Advance tickets recommended - walk up tickets may not be available.