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 its history. The Mughals built a section of the city (now known as Old City or 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. As the seat of the Government of India, New Delhi houses important offices of the federal government, including the Parliament of India.