The prehistoric megalithic temples at Hagar Qim and Mnajdra is Malta's Stonehenge, just older. They date back to about 3200 BC, predating both the Pyramids and Stonehenge, making them the oldest freestanding stone structures in the world. The huge slaps of rocks, which make up the temple complexes, stand tall on a ridge which breaks off into the Mediterranean Sea. Large tents have been erected over the temples to protect then from weather erosion. Surprisingly, little is known about these temples and the civilization who built them, but there are several others megalithic temples on Malta and Gozo: The Ġgantija Temples (Gozo), Tarxien Temples (Malta), Ta' Hagrat temples (Malta), and Skorba Temples. All of them are, of course, UNESCO World Heritage Sites.