Malta and Gozo are home to seven megalithic temples, the oldest free-standing stone structures in the world, all of which have been declared UNESCO World Heritage sites. But the temples of Ħaġar Qim and Mnajdra, together with the Hypogeum, Tarxien Temples, and the Ggantija Temples in Gozo, are the most famous and best preserved. These two make a fascinating pair, perched on a cliff overlooking the islet of Filfla to the west of Malta. Dating back to around 3600-3200 BC, the temples are impressive as you can actually walk around their large stones.