World's deadliest spot: the horror of Lake Karachay

By NASA, Jan Rieke (color correction, borders and labels) - NASA World Wind screenshot (Landsat Global Mosaic visual layer), Public Domain, Link

Standing for just one hour at the shore of Russia's Lake Karachay ("black water") in 1990 would have killed you. Before it was buried beneath concrete and stone, the lake held an apocalyptic secret: over 50 time…