What Is It? The Sutro Baths were designed by self-made millionaire Adolph Sutro in 1894 as the world’s largest indoor swimming pool. During the high tide, the Pacific Ocean would fill the pools with 1.7 million gallons of saltwater in just an hour. They were part of a lavish swimming facility that had over 500 private dressing rooms, restaurants and arcades that were enclosed by 100,000 square feet of glass. After Sutro died, his family maintained the baths for several decades, but it was closed down during the Great Depression.
Why Do It? The remaining structure still exists as interesting architectural ruins in the Golden Gate National Recreation Area at the north end of Ocean Beach near the Cliff House restaurant.
Good to Know: You can walk around the fascinating and somewhat eerie ruins – they’re rumored to be haunted.