One of the most beautiful mosques in Dubai is the one in Jumeirah. It was built in 1983 but still has the traditional style from older mosques. As non-muslims are not allowed to enter a mosque, you’ll only be able to admire the beauty of the building from outside.
It was only after returning to Germany, that I also noted a possibility to enter this building as a non-muslim. For that, please check the link below.