Jaipur is the capital city of Rajasthan, India, known as the "Pink City". It was founded in 1727 by Maharaja Sawai Jai Singh II. Some of Jaipur's most important historical sites include the Hawa Mahal, City Palace, Jantar Mantar Observatory, Jal Mahal, and Amber Fort. The City Palace located in the old part of Jaipur was built between 1729-1732 and features courtyards, buildings, and gardens. Jantar Mantar is the largest stone astronomical observatory in the world and was built to study space and time. Amber Fort served as the main residence for Rajput rulers and was constructed in 1592.