Lake Tanganyika in Africa is the second deepest lake in the world at 1,470 meters.

The London Underground is one of the oldest metro systems in the world.

Greenland is the world's largest island.

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

The Caspian Sea is technically the world's largest lake, covering 371,000 square kilometers.

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

New Zealand was one of the last places on Earth to be settled by humans, around 1250–1300 CE.

The Sahara Desert was once much greener than it is today.

The Golden Gate Bridge was completed in 1937.