The Ggantija Temples (place of giants) are thought to be the oldest free-standing structures in the world. They are among the best-preserved temples on the Maltese Islands. They are certainly the most visited historical site on the Maltese Islands. Excavated between 1816 and 1820, the complex comprises two Neolithic temples dating from the third millennium B.C (3600 to 3000 B.C.). The temples are made up of two separate units enclosed by a wall and sharing a common facade.