On June 30th 1908, 770 square miles of forest in Eastern Siberia were flattened by a massive explosion. 100 years later, we still don’t know what caused it.
In the late 1950s, a group of Russians who were very experienced ski-hikers were discovered to have died on the slopes of the Mountain of Death, some of them frozen to death and others dead from massive physical trauma. They left their camp in the middle of the night, some without clothing or shoes, in sub-zero weather. What terror caused them to flee to their deaths?