You can't beat the Taj Mahal.
It was commissioned in 1631 by the fifth Mughal emperor, Shah Jahan (r. 1628–1658) to house the tomb of his beloved wife, Mumtaz Mahal; it also houses the tomb of Shah Jahan himself. Mumtaz Mahal was Jahan's favourite wife, known for beauty. She died giving birth to their 14th child.