The original Broad Ripple Park (Indianapolis) Pool was the "largest in the world" at one point (250' x 500'). I knew people who swam in it, but it had been turned into basketball courts by the time I saw the former pool. Shortly after that, it was removed.

The US swimming Olympic tryouts were held there in 1924 and 1952.

https://indyencyclopedia.org/broad-ripple-park/

https://www.youtube.com/watch?v=9ifFaKeimuA