Six Flags in Louisiana, which has been abandoned since Katrina in 2005. The amusement part still sits untouched 6 years later and unclaimed. The land goes up for auction on October 31st (again) if the entertainment company currently bidding on it does not either tear down or use the land. It is quite eery to walk through the buildings that are still standing, some gutted, others still standing with rides untouched. You can still see the water lines from Katrina in some buildings.