Built by the wife of Humayun, Haji Begum in the mid 16th century, this red sand stone structure is considered to be the predecessor of Taj Mahal. The structure is one of the best example of Mughal Architecture. Humayun's wife is also buried in the red and white sandstone, black and yellow marble tomb. The entry in the complex is free on Fridays otherwise a nominal fees of .50 ps is charged

The high rubble built enclosure is entered through two lofty double-storeyed gateways on the west and south. A Baradari (pavilion) occupies the centre of the eastern wall and a Hammam (bath chamber) in the centre of northern wall. The lofty mausoleum is in the centre of the enclosure and rises from a podium faced with series of cells having arched openings.

The central octagonal chamber contains the cenotaph, encompassed by octagonal chambers at the diagonals and arched lobbies on the side. Their openings are closed with perforated screens. Three arches dominate each side, the central one being the highest. This plan is repeated on the second storey too. The roof surmounted by a double dome (42.5m) of marble has pillared kiosks (Chhatris) placed around it. Several rulers of the Mughal dynasty lie buried here. Bahadur Shah Zafar had taken refuge in this tomb with three princes during the First War Independence (AD 1857).

On the southwestern side of the Humayon Tomb is located Barber's Tomb (Nai-ka-Gumbad), which stands on a raised platform, reached by seven steps from the south. The building is square on plan and consists of a signal compartment covered with a double-dome.