Sopot is a town on the Baltic Sea in northern Poland. Along with neighboring cities Gdynia and Gdańsk, it forms the so-called Tri-City metropolitan area. Sopot is known for its health spas, sandy beach and its long wooden pier that extends into the Bay of Gdańsk. The Crooked House is a surreal building modeled on fairy-tale illustrations. It's on Sopot’s pedestrianized main street, Monciak, also called Monte Cassino.