Ggantija Temples in Xaghra, Gozo.
Ggantija (Giants' Tower) is a megalithic temple complex from the Neolithic on the Mediterranean island of Gozo.
Together with other similar structures, these have been designated a UNESCO World Heritage Site, the Megalithic Temples of Malta.
If you don't have a rental car in Malta, the Ggantija Temples can easily be visited on the Hop-on Hop-off Gozo sightseeing tour.