Construction started in 1632 and was finished in 1643, with the surrounding buildings and gardens taking about five more years to complete. It’s made of shiny white marble, and when the sun rises or sets, the building looks like it’s changing colours. One of the coolest things about the Taj Mahal is its perfect symmetry. Also, the tall towers, called minarets, look like they stand straight up, but they actually lean outwards a little bit. This way, if something bad happens, they won’t fall on the main tomb.