The Taj Mahal in Agra, India, is considered one of the most beautiful buildings in the world and the finest example of the late style of Indian Islamic architecture. Mughal emperor Shah Jahan ordered it built as a mausoleum for his favorite wife, Mumtaz Mahal. The building’s white marble exterior is inlaid with semiprecious stones arranged in Arabic inscriptions, floral designs, and arabesques, and its gardens reflect the Islamic Paradise. When was the monument’s construction begun? Discuss