One of the truly strangest places in the world is the barren former diamond mine located in Mirny, Russia. Known as the Mirna diamond mine, this defunct mining operation was the first Soviet diamond mine and it is the second largest man-made excavated hole in the world. It is roughly 525 meters deep, and its diameter measures at 1.25 kilometers across. Staring into the hole is dizzying, as it is a series of cracked layers streaked with white, red and gray. The layers remind one of an inverted Devo hat. The climate was horrendous, resulting in the mine being frozen over for seven months of the year and oil freezing in the construction equipment.