Kirill Oreshkin likes taking photographs. Selfies, landscapes, the usual stuff—except his shots are captured atop some of the world's tallest buildings. Once Oreshkin gets as high as the stairs or elevator will take him, he often scales up scaffolding or other parts of the structure. The tallest building he has climbed to date is the Mercury City Tower in Moscow. At 338 meters (about 1,109 feet), it's the tallest in Europe. Oreshkin is one of Russia's extreme urban climbers, known to hang off the edge of buildings by only his fingers. He does all this unsupervised and without any safety gear.