This giant pile of rocks is essentially a mound of nuclear waste.

To be precise, it's 1.5 million cubic yards of hazardous waste entombed to create a small mountain that marks the spot that was home to the country's largest explosives factory turned uranium ore processing plant until 1966. After being left abandoned for over two decades, the US Department of Energy decided to cover it with rocks. Now, it features a museum and covered up TNT, asbestos, mercury, radium and radioactive uranium. Enjoy!