Dear Yi Paul,
This is a difficult Q to answer because "Arabic" is such a broad term...
However, I picked three examples for you: The first is the Hagia Sophia (built 537 AD) in Istanbul, one of the most famous buildings in the world; built as a cathedral but also a mosque in its long history. And historically, Arabs might be Christian or Jewish as well as Muslim, although most Arabs are now Muslim.
Second is modern Arabic architecture after the pattern of the beautiful mosques. And last is some contemporary construction in modern Dubai!
