The Taj Mahal is one of the most famous buildings in the world: the mausoleum of Shan Jahan’s favorite wife, Mumtaz Mahal. It is one of the New Seven Wonders of the world, and one of three World Heritage Sites in Agra.
Completed in 1653, the Taj Mahal was built by the Mughal king Shah Jahan as the final resting place for his beloved wife, Mumtāz Mahal. Finished in marble, it is perhaps India's most fascinating and beautiful monument. 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 Taj Mahal is on the 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. It is an acknowledged masterpiece of symmetry. Verses of the Koran are inscribed on it and at the top of the gate are twenty-two small domes, signifying the number of years the monument took to build. The Taj Mahall was built on a marble platform that stands above a sandstone one. The most elegant dome of the Taj Mahal has a diameter of 60 feet (18 m), and rises to a height of 80 feet (24 m); directly under this dome is the tomb of Mumtāz Mahal. Shah Jahān's tomb was erected next to hers by his son Aurangzeb. The interiors are decorated by fine inlay work, incorporating semi-precious stones. More info in Wikipedia.