Jaipur is familiarly known as the “Pink City” and is the largest city in Rajasthan. Jaipur was India's first planned city and is now is a major tourist attraction belonging to the Golden Triangle of Delhi, Jaipur and Agra. Jaipur is often called Pink City in reference to its colored buildings, originally painted pink to imitate the red sandstone architecture of Mughal settlements. Today’s reddish color originates from the repainting of the buildings done for a special visit by the Prince of Wales. Not only the capital of Rajasthan, Jaipur has many attractions, including UNESCO world heritage sites, and is a major hub for tourism: Amber Fort, Jaipur City Palace, Jantar Mantar Observatory, Jal Mahal Floating Palace, among many others.