Göbeklitepe has been on UNESCO's World Heritage Tentative List since 2011.
It was discovered in 1963 when researchers from Istanbul and Chicago universities were working at the site. Since then, the excavations have never stopped.
The German Archaeological Institute and Şanlıurfa Museum have done joint works at the site since 1995 and have found T-shaped obelisks from the Neolithic era measuring 3-6 meters (10-20 feet) high, and weighing 40-60 tons.