Sialk hills historical site is located approximately 4 kilometers southwest of Kashan, which is composed of two hills and two cemeteries. Sialk area has been known as one of the oldest centers of prehistoric human settlement in Iran, which was built around the 3000 BC. Not had anybody realized its value and its historical significance of before the scientific explorations.

The civilization of the people on Sialk hills was dominated by Aryan civilization 5000 years ago. Sialk Tappeh was actually a ziggurat, or a temple, which was made of clay and terracotta.