Night view of The Jaisalmer Fort - Built in 1156 by the Bahtti Rajput ruler Jaisala, and reinforced by later rulers, the fort crowns the 80m - high Trikuta Hill. Over the centuries it was the focus of many battles between the Bhatties, the Mughals of Delhi and the Rathores of Jodhpur. This is one of the planets only living forts, with one quarter of the old city's population residing in it. The fort has 99 bastions around its circumference and is protected by three walls. The lower wall is of solid stone blocks which reinforce the loose rubble of which Trikuta hill is composed. The second wall snakes around the fort, and between this and the third, of inner, wall, the warrior Rajputs hurled boiling oil and water, and massive round missiles on their unwitting enemies below.