Riyadh, Saudi Arabia

Riyadh is a high-rise metropolis rising from the desert, where glass-clad business towers rub shoulders with centuries-old mud-brick Masmak Fort and sprawling date-palm oases. The capital steers the Kingdom’s economic engine, hosting the Saudi Stock Exchange and King Abdullah Financial District, while the National Museum, Souq al-Zal, and Diriyah’s mud ruins anchor its cultural identity. With 7.2 million residents—nearly a quarter of all Saudis—the city hums around the clock, its gridlocked freeways book-ended by camel-dotted dunes and the world’s tallest unsupported flagpole.