Meteoric Events.

On June 30th, 1908, the Tunguska Blast flattened a whole lot of Siberian Taiga. On August 13, 1930, a blast at Rio Curaca in Brazil wipes out hundreds of square miles of jungle. On December 11th, 1935, a blast in the Rupununi region of British Guiana may have even been more devastating than the Tunguska Blast itself. Here is a list of impact events through history.

Props to Matt for the original statement and research.