If you’ve wandered around Machu Picchu, or Stonehenge, or the Colosseum, or even snuck into that abandoned house on the edge of town, you know the power in a piece of decrepit architecture. And even if you don’t want to leave your house, the internet is littered with evidence of the human love affair with all things abandoned. People flock to remainders of ancient civilizations, but people also flock to things that just look like they’re ancient. The combination of decomposition and romance makes a perfect cocktail of repulsion and allure. And for San Franciscans, this place is Sutro Baths. At the northwestern edge of San Francisco, right on the Pacific Ocean, is a curious jumble of concrete ruins. You wouldn’t know just looking at it, but this ruin is quite young. It’s what’s left of Sutro Baths, a palatial indoor swimming pool and amusement park built in 1898.