Taj Mahal is one of the modern wonders of the world due to its impressive architectural forms and building techniques. It was built as a mausoleum for Shah Jahan in India over 22 years using white marble with decorative stonework. The main building has a square shape and dome above with four obelisks at each corner, and the surrounding landscape and water pool provide a historical and ecological context. Twenty thousand people worked on its construction, combining Indu and Persian-Muslim traditions with materials brought from over 300 km away.