A popular tourist destination in Odessa, Ukraine, this so-called "Flat House" is also known as the "Devil's House" or the "Witch House," according to Discover Ukraine.
In real life, it just looks like a regular row of apartments. But from certain angles, the side of the building seems to disappear, creating a mind-boggling visual trick.
According to Discover Ukraine, the building has no back wall, and its side walls are at an angle, ultimately creating a triangular building and the effect of a flat building, if you're viewing it from this angle.