1) The Great Barrier Reef in Australia is the largest living structure on Earth and can be seen from space.

2) The word "guitar" contains three vowels: U, A, and I.

3) The Andes, stretching along the western coast of South America, is the longest mountain range in the world, spanning over 4,300 miles (7,000 kilometers).

4) The world's most expensive car is the Bugatti La Voiture Noire, which sold for over $18 million.