Abu Dhabi is situated on a peninsula that lies in the middle of the Persian Gulf coastline. Persian Gulf was the best location for pearls. Therefore, Abu Dhabi worked in the pearl business and traded with others. Abu Dhabi is a metropolis and one of the most expensive city in the world. It has experienced rapid development and urbanization, combined with the relatively high average income of its population. No wonder you will see many high-rise buildings or skyscrapers.
Until the 16th century, Riyadh (or Ar-Riyadh) formerly known as Hajr. Riyadh is a city with hot desert climate. Being a desert city, Riyadh today is one of the fastest growing cities in the world. Riyadh has developed into a global city and become a focal point for both travel and trade. It is now one of the richest cities in the Middle East and the 80th richest city in the world.