Ġgantija

Two limestone temples on Gozo built around 3600 BC, over 5,500 years old, older than the pyramids and older than Stonehenge, and the second oldest standing religious structures on Earth after Göbekli Tepe. They are laid out in a clover-leaf of semi-circular apses off a central passage, and the southern temple still stands about six metres. Then remember what the builders did not have: no wheel, and no metal tools of any kind. Spherical stones found around the site were probably used as ball bearings to roll the blocks in. The name comes from the Maltese for giant, because the obvious local explanation for stones that size was that giants put them there. UNESCO listed it in 1980 and folded it into the Megalithic Temples of Malta in 1992. Heritage Malta runs it, with raised walkways since 2011 and a heritage park since 2013. Xagħra, Gozo.