This fountain is utterly baffling at first glance. If you're wondering how this optical illusion is achieved, I can tell you that it's supported by a pipe that runs through the middle of the fountain's stream of water. It's located at the Aqualand theme park in the Spanish city of Cadiz.
6. Giant at the entrance to Crystal Worlds, Watten, Austria
Swarovski Crystal Worlds is a museum located in Wattens, Austria. It was built in 1995 to celebrate the 100th anniversary of the world-famous crystal jeweler, Swarovski. The entrance to the museum is covered by a glass-covered head. The head's mouth is the fountain, and water cascades over the entrance into a man-made lake.