Yes, Kennywood Park, located near Pittsburgh, was once home to a massive and legendary swimming pool that operated from 1925 to 1973. At the time of its construction, it was one of the largest and most modern pools in the United States, measuring roughly 350 feet by 180 feet. It was a centerpiece of the park's "Golden Age," featuring a massive sand beach, high-diving boards, and a capacity for thousands of swimmers. Interestingly, the pool wasn't actually demolished when it closed; it was simply filled in with dirt and paved over. Today, the area where the pool once stood is occupied by the Lost Kennywood section of the park. During the construction of Lost Kennywood in the mid-1990s, workers actually uncovered the original concrete walls and tile work of the old pool, confirming that it remains a subterranean relic of the park's past. The original pool refreshment stand still stands today, serving as a snack bar near the Noah's Ark attraction.