The city of Rome was built on seven hills — today it sprawls across 15 hills.

Angel Falls in Venezuela is the world's highest uninterrupted waterfall at 979 meters.

The Silk Road connected Asia and Europe for centuries.

The Gobi Desert is the fastest-expanding desert in the world and covers parts of northern China and southern Mongolia.

The United States purchased Florida from Spain in 1819.

The Atacama Desert in Chile is so dry that some weather stations there have never recorded rain.

Antarctica is technically a desert — it receives less precipitation than the Sahara.

Mount Everest is not the closest point to space — that title goes to Mount Chimborazo in Ecuador due to Earth's equatorial bulge.

Antarctica is technically a desert because it receives very little precipitation.