Islamabad is home to many migrants from other regions of Pakistan and has a cultural and religious diversity of considerable antiquity. Due to its location on the Pothohar Plateau, remnants of ancient cultures and civilisations such as Aryan, Soanian, and Indus Valley civilisation can still be found in the region. A 15th-century Gakhar fort, Pharwala Fort is located near Islamabad. Rawat Fort in the region was built by the Gakhars in 16th century and contains the grave of the Gakhar chief, Sultan Sarang Khan.