Göbekli Tepe is the site of the oldest known man-made religious structure, a temple dating to circa 10,000 BC, while Çatalhöyük is a very large Neolithic and Chalcolithic settlement in southern Anatolia, which existed from approximately 7500 BC to 5700 BC. It is the largest and best-preserved Neolithic site found to date and is a UNESCO World Heritage Site. The settlement of Troy started in the Neolithic Age and continued into the Iron Age.