Głęboka Street in Cieszyn is considered the most important street of the city. It was laid out in the Middle Ages, as a link between the castle and the Piast market square. It was once called “Poland”, and later it changed its name several times. There are dozens of historical buildings in the street. They are mostly from the late nineteenth and early twentieth century. The most beautiful, richly decorated, neo-Renaissance building is the so-called German House, which now serves as a library.