On June 30th, 1908, something happened deep in the forests of Siberia, near the Tunguska River. A powerful explosion, one large enough to have completely wiped a city the size of London or New York off the map, shook the forest, leaving scarcely a tree standing.  (h/t NileGuide) Nobody is entirely sure what happened-despite evidence that the blast was as powerful as 185 Hiroshimas, it didn't leave a crater.  According to the NASA website, the local people believed that the god Ogdy had cursed the area. Here's how one of them described the blast to researchers many years later: Suddenly in the north sky… the sky was split in two, and high above the forest the whole northern part of the sky appeared covered with fire… At that moment there was a bang in the sky and a mighty crashâ

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