The Indian mausoleum made of white marble that is a World Heritage Site is the Taj Mahal.
The Taj Mahal stands on the bank of the Yamuna River in Agra, India. Mughal emperor Shah Jahan commissioned it as a mausoleum for his wife, Mumtaz Mahal, who died in 1631. The central tomb is part of a larger symmetrical complex containing formal gardens, a monumental gateway, a mosque, and a matching guesthouse.
Construction of the mausoleum was completed in 1648, while work on the wider complex continued until about 1653. Its white marble came mainly from Makrana in Rajasthan, and the surfaces feature delicate carving, Quranic calligraphy, and pietra dura inlay using colored stones. Shah Jahan was later buried inside beside Mumtaz Mahal, although the cenotaphs visitors see are symbolic; the actual graves are in a lower chamber.
UNESCO inscribed the Taj Mahal as a World Heritage Site in 1983. Hawa Mahal, Qutub Minar, and Red Fort are also major Indian monuments, but they are different buildings and do not fit this mausoleum clue.