River Country
Built in 1976, this was WDW’s first waterpark. Its water came from Bay Lake. Brain-eating amoeba in the waters infected an 11-year-old boy in the ’80s, and the park closed in 2001 after low post-9/11 attendance, but it was never demolished and trespassers post videos of the overgrown, alligator-populated property online from time to time.