Filmmaker Geoffrey Feinberg is afraid of heights. So when he first stumbled upon Kirill Oreshkin’s daredevil selfies, “they made me break out in a cold sweat,” Feinberg told The Atlantic. Oreshkin, a self-described urban explorer who has been dubbed the “Russian Spiderman,” frequently scales Moscow’s tallest buildings; at the top, he snaps a photo of himself perilously hanging, one-handed, from the ledge. Intrigued by Oreshkin and the growing roofing subculture he’s a part of, Feinberg traveled to Moscow to follow the 19-year-old as he climbed buildings across the city over the course of two weeks.