1. Taj Mahal, Agra: The Taj Mahal is a white marble mausoleum located in Agra, India. It was built by Mughal Emperor Shah Jahan in memory of his third wife, Mumtaz Mahal, who died during the birth of their 14th child in 1631. The Taj Mahal is widely considered as one of the most beautiful buildings in the world and is a UNESCO World Heritage Site.