Step back in time and uncover the secrets of San Francisco’s most captivating coastal mystery. On Sutro Baths: The Story of the Ruins, you’ll leave the bustling city streets behind to explore a playground lost to time. What is now a hauntingly beautiful grid of concrete foundations perched on the edge of the Pacific was once a spectacular, 10,000-pane glass “Crystal Palace” capable of hosting 10,000 Victorian-era swimmers at a single time.

Led by an expert storyteller, this guided historical walk brings the Gilded Age roaring back to life. You’ll walk the massive promenade walls, venture through a dark sea cave blasted straight into the cliffside, and discover the incredible engineering that used ocean tides to fill seven massive pools.