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 book series "The Chronicles of Narnia" by C.S. Lewis has sold over 100 million copies worldwide.

3) The strongest natural material known to man is spider silk. It is stronger than steel and more flexible than nylon.

4) Insurance fraud occurs when individuals or organizations deliberately deceive insurance companies to receive undeserved benefits.