Are you kidding me or have you become blind?
The Arab world, which is home to almost 100 World UNESCO Heritage Sites alone, home to arguably the most famous historical monuments and hundreds if not thousands of well-kept cities, towns and villages, has only beautiful mosques to offer? Despite being famous for its architecture and the above mentioned facts? I am afraid that your theory is ridiculous which this thread clearly confirms. No offense.
Bahrain:
Bahrain Fort by
hqasem, on Flickr
Founded in 2300 BC. It's first foundations were founded by the native and ancient Semitic Dilmun civilization. It's a World UNESCO Heritage Site today. Many sites are found in Eastern Arabia (KSA and Bahrain).
Qal'at al-Bahrain - Wikipedia, the free encyclopedia
https://en.wikipedia.org/wiki/Dilmun
Oman:
Oman is famous for its hundreds of well kept forts and castles. Here are a few.
Muttrah Corniche #2 by
momentaryawe.com, on Flickr
Nizwa Town ولاية نزوى by
digitalazia, on Flickr
@ 200m high... Nakhal Fort in a cloudy day! by
Beauty Eye, on Flickr
Ittin, Salalah, Dhofar by
Shanfari.net, on Flickr
Oman 09 by
Toni.P, on Flickr
Infinity pool by
CruisAir, on Flickr