Jaipur , also popularly known as the Pink City, is the capital of Rajasthan state, India. Historically rendered as Jeypore, Jaipur is the former capital of the princely state of Jaipur. Founded in 1727 by Maharaja Sawai Jai Singh, the ruler of Amber, the city today has a population of more than 5 million residents. The city is remarkable among pre-modern Indian cities for the width and regularity of its streets which are laid out into six sectors separated by broad streets 111 ft (34 m) wide. The urban quarters are further divided by networks of gridded streets. Five quarters wrap around the east, south, and west sides of a central palace quarter, with a sixth quarter immediately to the east. The Palace quarter encloses a sprawling palace complex (the Hawa Mahal, or palace of winds), formal gardens, and a small lake. Nahargarh Fort crowns the hill in the northwest corner of the old city. Another noteworthy building is Sawai Jai Singh's observatory, Jantar Mantar.