The Endless Staircase
This staircase is actually a piece of art designed by Olafur Eliasson. It is a double spiral of steel standing over 9 meters high at the entrance of the KPMG office building in Munich, Germany. The blend of art & architecture, completed in 2004, is called Umschreibung. It is believed to be the only staircase in the world that a person can go up and down without changing direction.