The must-see Humayun's Tomb is a brilliant example of early Mughal architecture. It was built in the mid-16th century by Haji Begum, the Persian-born senior wife of the second Mughal emperor Humayun.

Elements in its design - a squat building with high arched entrances that let in light, topped by a bulbous dome and surrounded by formal gardens - were to be refined over the years to eventually create the magnificence of Agra's Taj Mahal. Haji Begum is buried in the red-and-white sandstone and black-and-yellow marble tomb. The octagonal tomb of Isa Khan is through a gate to the left of the entrance and is a fine example of Lodi architecture.