Delhi is the second-largest metropolis in India after Mumbai with a population of 13 million. It is located in northern India on the banks of the River Yamuna.
Delhi is one of the oldest continually inhabited cities in the world. Having been the capital of several empires in ancient India, Delhi was a major city in the old trade routes from northwest India to the Gangetic Plains. Many ancient monuments, archaeological sites and remains of national importance have been erected in it's history. The Mughals built a section of the city (now known as Old Delhi) that served as the capital of Mughal Empire for a long period. During the British Raj, New Delhi was built as an administrative quarter of the city. New Delhi was declared the capital of India after India gained independence from British rule in 1947.