14. The Patomskiy Crater
This odd rock formation has baffled scientists for decades. In 1949, scientists discovered a large crater in southeastern Russia. The rock is made up of large chunks of limestone. Scientists believe that the crater was formed no more than 350 years ago.
Geologists have posited that the crater was a result of either a volcanic eruption, meteorite, and some sort of subterranean gaseous explosion. Naturally, some suspect extra-terrestrial beings.