The headquarters of the Oil and Natural Gas Corporation Limited at Dehradun (ONGC) was set up in Tel Bhawan (Patiala House), at Dehradun in 1956. ONGC is the foremost exploration and production company in India. It is responsible for most of the exploration effort, established reserves and oil and gas production in India. ONGC possesses the fiscal, technical and managerial strength to rank as a world-class oil and gas company. At ONGC Museum you get to learn a lot about oil exploration, refinery etc.