The fort was built in 1541-43 by Sher Shah Suri to protect the area against the Gakhars [a fierce war-like clan who were loyal to the Mughal ruler Humayun]. The fort was finally surrendered to them by a untrustworthy commander 10 years after Sher Khan's death. The fort was named after the site where Sher Khan defeated the Mughals. After the structure was abandoned by the military in the early 18th century, a village was built inside its walls.The walls of the Rohtas Fort measure up to 12.5 meters (41 feet) in thickness and up to 18.28 meters (60 feet) in height. They extend for 4 km (2.5 miles) and feature 68 semi-circular bastions. Its sandstone gates, both massive and ornate, are thought to have exerted a profound influence on the Mughal military architecture. The fort has 12 gates (4 are trap gates), 68 bastions, 1900 battlements and 9500 stairs.
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[All but 2 are from my personal collection, I highly recommend you visit this beautiful place!]