Completed in 1653, the Tāj Mahal was built by the Mughal king Shah Jahan as the final resting place for his beloved wife, Mumtāz Mahal. Finished in marble, this perfectly symmetrical monument took 22 years (1630–1652) of labour and 20,000 workers, masons and jewellers to build and is set amidst landscaped gardens. Built by the Persian architect, Ustād 'Īsā, the Tāj Mahal is on the south bank of the Yamuna River. It can be observed from Agra Fort from where Emperor Shāh Jahān gazed at it for the last eight years of his life, a prisoner of his son Aurangzeb.