Wunderland Kalkar started life as Schneller Brüter, a planned nuclear power plant built between 1972 and 1991 for approximately 4 billion Euro (US$5.3 billion), reports Gizmag. But political reasons kept the the power plant from ever being fired up.
After the plans for a nuclear plant suffered a meltdown, the land was bought by a Dutch investor, who turned the site into a massive amusement park.
Wunderland Kalkar covers 55 hectares (136 acres). The wiring used to supply it with power could circle the globe twice.
Much of the nuclear plant's infrastructure was incorporated into the park. The cooling tower, ominous icon of nuclear power, is now a climbing wall, with a giant swing ride in the center (be careful you don't fallout).