The beautiful red and white sandstone building was built in 1570 by Haji Begum, Emperor Humayun's senior wife, and has the distinction of being the first garden tomb in the subcontinent. Built in the Persian charbagh, quartered garden, style, the central tomb is surrounded by four squares separated by water pathways forming this typical Mughal garden. The building is topped with a soaring double dome, rising to a height of 38 meters.

Other intriguing sights within the grounds include a square tomb belonging to Humayun's barber. His importance lay in the fact that he was the only man who could hold a knife to the emperor's throat! An octagonal tomb with a blue tiled dome marks the grave of a faithful servant and some believe this might be older than the Emperor's mausoleum.