San Francisco used to be home to a massive swimming complex. It was called the Sutro Baths, and it was full of both fresh and saltwater pools. Built at the direction of the mayor himself, the project was an absolute hit. The facility was open from 1896 until 1964. But then, the bills came in. Maintenance and upkeep for all those pools were getting awfully expensive. You know what happened next!
The city sold the Sutro Baths, and the whole complex was closed. Then, the whole place was destroyed by a freak fire in 1966. Parts of the structure are still standing today. But as you might imagine, everything that made it special is gone for good.