why was the Taj Mahal chosen as a world heritage listed?

plz help me i gotta do this geography assignment and it’s on world heritage sites

please is u know any thing about the following site plz tell me.

angkor
nubian monument
great wall of china
stonehedge
grand canyon national park
manu national park

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The Advisory Board Evaluation for inclusion of the Taj Mahal as a World Heritage site in 1983 is on the website below.

http://whc.unesco.org/archive/advisory_body_evaluation/252.pdf

UNESCO World Heritage List includes all 878 properties.

Click on each name for more information.
http://whc.unesco.org/en/list

Cambodia – Angkor (listed in 1992)
Egypt – Nubian Monuments from Abu Simbel to Philae (listed in 1979)
China – The Great Wall (listed 1987)
United Kingdom of Great Britain and Northern Ireland -
Stonehenge, Avebury and Associated Sites (listed 1986)
United States of America – Grand Canyon National Park (listed 1979)
Peru – Manú National Park (listed 1987)