"Lal Qila, the massive 17th Century Red Fort, once was home to 5,000 residents. Built between 1639 and 1648 with red sandstone brought from Rajasthan by Mogul King Shah Jahan, the Red Fort is surrounded by a 1.5 mile wall. It initially served as the capital of Shah Jahan's empire. The same king commissioned construction of the Taj Mahal in Agra as a monument to his wife... A shopping bazaar is within."