The Taj Mahal is a mausoleum located in the city of Agra, India. It was built by the Mughal emperor Shah Jahan in memory of his wife, Mumtaz Mahal. The Taj Mahal is considered one of the most beautiful buildings in the world and is considered a UNESCO World Heritage Site. The Taj Mahal has an onion-shaped dome which is a characteristic feature of Mughal architecture.