Also known as wisielec (which can be interpreted as either 'hanging building' or 'hanging man', depending on how morbid you're feeling that day), the 'line-core building' is a pretty odd construction. Its eleven hefty stories appear to float above street level thanks to a reinforced concrete core around which floors were suspended suspended on steel cables - or at least that was the original design. Seven years after the building's completion, in 1974, the cables were encased in concrete and metal beams were added to the bottom of the building for rigidity - much to the dismay of architects Jacek Burzyński and Andrzej Skorupa. Though unusual, this building is not unique: similar structures include the former Central Bank building in Dublin and The Cube in Vancouver.