Photo: Doron [wikipedia]
What if M.C. Escher designed a real life building? It'd probably be something like the Chand Baori stepwell near Jaipur, India. The amazing 13-stories well was built in the 9th century and has 3,500 narrow steps. Don't fall - at 100 feet (~30 m) deep, it's a long way down.
Oddity Central has more: Link - via Scribal Terror
--TwoDragons