Sudan has more ancient pyramids than Egypt — over 200, though smaller and less known.

The Aswan High Dam controls flooding of the Nile River.

Zhangye once stood along the Silk Road as a trade hub.

The United States purchased Florida from Spain in 1819.

Countries with extremely high tax rates sometimes collect less revenue than countries with moderate tax rates.

The Great Rift Valley in Africa may eventually split the continent in two, forming a new ocean in millions of years.

Mount Everest is the tallest mountain above sea level.

The border between Belgium and the Netherlands runs through a bar in the town of Baarle-Hertog.

The Palm Islands in Dubai were constructed using land reclamation techniques.