Built by the Mughal emperor Aurangzeb, this was long the largest mosque in the world. Entrance is free, but you will be asked to pay about Rs 10 (Nov 2006) to the shoekeeper upon exit. Try going late at night, when there are few people there. Since mosques are holy places, do not wear shorts to this or any mosque; women are advised to wear long or half-sleeved clothing, and to carry a shawl so they can cover their head. Remove shoes before entering.