Dehradun is one of the oldest cities of India and is the Capital of Uttarakhand state and is also known as the ‘Adobe of Drona’, Dehradun has always been an important center for Garhwal rulers which was captured by the British. The headquarters of many National Institutes and Organizations like ONGC, Survey of India, Forest Research Institute, Indian Institute of Petroleum etc are located in the city. During the reign of Aurangzeb, Ram Rai, Guru of the Udasi Sikhs on being ordered by the Mughal king to retire to the wilderness of the Dun, had pitched his tents here in what is now the Khurbura locality of the town and has also built a temple near Dhanawala. Around these two sites, grew up the town popularly known as Dehra. The term dun or doon means the low lands at the foot of a mountain range, and as the bulk of the district lies in such a terrain, it justified the dun part of the name.