Given how much they cost to construct, and all the work they require, you might think the arenas and stadiums where we gather to watch sporting events would last for a long, long time. Unfortunately, youâ??d be wrong. All over the world, former teams and tenants have abandoned buildings that were once filled with fans. A few lucky facilities have found a new lease on life, while others are simply gathering dust, or falling down. Take a tour of these sporting sites that once knew athletic glory to see where things stand now.