Riyadh is the capital and largest city of Saudi Arabia. It is one of the richest cities in the Middle East and the 80th richest city in the world. Once a small, walled city, Riyadh has developed into a dynamic metropolis over the years and has become a focal point for both travel and trade. In addition to being the centre of power, the city is also a commercial hub. Numerous educational, financial, agricultural, cultural, technical, and social organisations have set up base here.