Park historian John Martini will lead a short but strenuous exploration walk in, around, and through the ruins of Sutro Baths, once the world’s largest indoor swimming complex. Find out how Adolph Sutro built his great Baths, how they operated, who went there, and what recreation was like at “The Cliff" 120 years ago. A book signing of John’s new book Sutro’s Glass Palace: the Story of Sutro Baths will follow at the Lands End Lookout.

This walk is a special benefit for Parks Conservancy members—if you are not a member already, you can become a member and RSVP for this event by calling (415) 561-3060. You can also join online here.