Most of my week in Abu Dhabi was in a classroom, however I did get the chance to visit the Sheikh Zayed Mosque not once but twice. The mosque is the largest one in the United Arab Emirates. It took 11 years to build at a cost of roughly $545 million USD.
"The mosque is large enough to accommodate over 40,000 worshippers, while the main prayer hall can hold over 7,000. There are two smaller prayer halls, with a capacity of 1,500 each, one of which is the women's prayer hall." - Wikipedia
There was several murals of the tree of life.
My second visit to the mosque was during the day.
"There are four minarets on the four corners of the courtyard which rise about 107 m (351 ft) in height. The courtyard, with its floral design, measures about 17,000 m2 (180,000 sq ft), and is considered to be the largest example of marble mosaic in the world." - Wikipedia
The mosque has 82 domes of seven different sizes.
"The Sheikh Zayed Grand Mosque has seven imported chandeliers from the company Faustig in Munich, Germany that incorporate millions of Swarovski crystals. The largest chandelier is the second largest known chandelier inside a mosque, the third largest in the world and has a 10 m (33 ft) diameter and a 15 m (49 ft) height." - Wikipedia