During the 1950s and 60s, most of the largest high school gyms in the country were built in Indiana. Today, a dozen that hold 6,000 fans or more are still in use, with 32 holding 5,000 or more. What caused the building boom – and why so darn big? Not so much bragging rights of having the biggest gym ever built as much as to simply meet the demand and to act as hosts for postseason play.