Built in 1565, the tomb of the second Mughal Emperor Humayun (r.1530-40 & 1555-56), was commssioned by his wife Haji Begum. It was the first garden-tomb on the Indian subcontinent and is architecturally important because its plan and form were precursors to those of the Taj Mahal. The garden is based on the traditional persian char-bagh plan. The mausoleum built of red sandstone trimmed with marble sits on a high plinth and is crowned by imposing white marble dome.