Spook Hill is a gravity hill, an optical illusion where cars appear to roll up the spooky hill in Lake Wales, Florida. Spook Hill is located on the Lake Wales Ridge, a geologically significant range of sand and limestone hills, which were islands from two to three million years ago, when sea levels were much higher than at present. The attraction is adjacent to Spook Hill Elementary School that adopted Casper The Friendly Ghost as their school mascot.