1) The Great Wall of China is a UNESCO World Heritage site and one of the most iconic man-made structures in the world. It stretches over 21,196 kilometers (13,171 miles) and was constructed to protect the Chinese empire from invasions during ancient times.

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

3) The word "elephant" contains three vowels: E, A, and E.

4) Insurance premiums are the payments made by policyholders to insurance companies in exchange for coverage.