Liechtenstein and Uzbekistan are the only two doubly landlocked countries in the world.

The tallest mountain above sea level is Mount Everest.

Ciudad Perdida in Colombia predates Machu Picchu.

The Andes Mountains are still rising today.

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

The Great Lakes were formed by glacial movement.

The Nile is generally considered the world's longest river, but some measurements put the Amazon ahead depending on source point.

The Pacific Ring of Fire contains many of the world's active volcanoes.

The coldest temperature recorded on Earth occurred in Antarctica.