The Palm Islands in Dubai were constructed using land reclamation techniques.

Greenland is 80% covered by ice — if it all melted, global sea levels would rise about 20 feet.

The world's deepest lake is Lake Baikal in Russia, containing 20% of the world's unfrozen fresh water.

The United States has no official language — English is the dominant language but is not legally designated.

The Nile River delta is fertile farmland.

The Millau Viaduct in France is one of the tallest bridges in the world.

The Ganges Delta is the world's largest river delta, covering over 100,000 square kilometers.

The border between Belgium and the Netherlands runs through a bar in the town of Baarle-Hertog.

Iceland sits directly on the Mid-Atlantic Ridge and is actually spreading by 2.5 cm per year as two tectonic plates diverge.