The Sahara Desert contains vast rocky plateaus as well as sand dunes.

The Andes Mountains are still rising today.

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

The Caspian Sea is the world's largest inland body of water and is classified as a lake despite its salt water.

The shortest commercial flight in the world is between two Scottish islands — it lasts about 90 seconds.

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

The Andes are one of the longest mountain ranges in the world.

The Colosseum in Rome could hold between 50,000 and 80,000 spectators and had a retractable awning called the velarium.

The Mediterranean Sea connects Europe, Asia, and Africa.