The two temples at Ggantija on the Maltese island of Gozo are notable for their gigantic Neolithic structures.
They are the world's oldest freestanding structures, and the world's oldest religious structures, predating the Pyramids of Egypt and Stonehenge.
The temples, each constructed as a series of semicircular apses connected with a hall in the centers, are possibly the sites of an Earth Mother Goddess Fertility Cult, with numerous figurines and statues found on site that archaeologists believe are connected with that cult.
The temples are cloverleaf-shaped; built up with cyclopean facing stones and filled in with rubble.
Each is constructed as a series of semicircular apses connected with a hall in the center.
Archaeologists believe that masonry domes originally covered the apses.
The southern temple, the older and more extensive of the two, dates to approximately 3600 BCE.
Like other megalithic sites in Malta, the temple faces southeast.
It rises to a height of six meters.
At the entrance sits a large stone block with a recess that some archaeologists have hypothesized as a ritual ablution station for purification before entering the complex.
The five apses contain various altars; evidence of animal bones in the site suggests the site was used for animal sacrifice.
Carvings that decorate the site depict goats, sheep, and pigs of both sexes, possibly showing which animals were used by the sacrificial cult.
The structures are all the more impressive for having been constructed at a time when no metal tools were available to the natives of the Maltese islands, and when the wheel had not yet been introduced.
Small, spherical stones have been discovered; it is believed that these were used as ball bearings to transport the enormous stone blocks required for the temples' construction.