The Pangaea supercontinent existed before breaking apart.

Around 90% of the world's population lives in the Northern Hemisphere.

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

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

The Nile flows northward — it is one of the few major rivers in the world that flows from south to north.

The Sahara Desert is roughly the same size as the United States.

The city of Jericho is one of the oldest known walled cities.

The Eiffel Tower can grow over six inches taller in summer.

The ancient city of Byblos is one of the oldest continuously inhabited places.