1. Blue Hole & Azure Window
A popular scuba diving and archaeological site, Azure Window is a huge limestone formation in the shape of an arch in the Maltese island of Gozo. Blue Hole is yet another striking geological formation- a vertical chimney of limestone which is about 25 meters deep with an underwater arch connecting with the open sea. In the year 2011, a few scenes of Games of Thrones were filmed here which covered the area with construction sand for which the local production company ran into trouble.