Peth Fort, also called as Kotligad, is one of the major tourist attractions near Karjat. The fort is built on a cone-shaped hill from where the Western Ghats, Wandre Khind Pass and Bhimashankar can be seen. The fort derives its name from its location in the Peth village which is situated at the foothills of the fort.An idol of Lord Bhairoba is enshrined in a small cave near the fort. The fort is in ruins but water cisterns near the entrance of the cave can still be seen. It is believed that the fort was constructed by the Marathas to safeguard their kingdom from enemies. Small rooms, used by the Marathas to store ammunition, can be seen inside the fort.A vertical tunnel inside the fort leads to the top of the fort, from where the Sahyadri range and the Konkan plains can be seen. The Phansad Wildlife Sanctuary and the Nethersole Dam are located in the vicinity of the Peth Fort.