The gate of the Theresianum Academy in Vienna, Austria, is one heck of an optical illusion. This mind-boggling design appears to extend back into space, so the viewer thinks that the actual wrought iron gate is much farther down the path.
Note: The Theresianum Academy is a private boarding and day school founded in 1746 by Empress Maria Theresa of Austria.
www.theresianum.ac.at/ 