1) The discovery of the Americas by Christopher Columbus in 1492 opened up new trade routes and had a profound impact on world history.

2) The largest living structure on Earth is the Great Barrier Reef, spanning over 2,300 kilometers (1,400 miles) along the coast of Australia.

3) The Alps, located in Europe, are a popular destination for skiing, mountaineering, and hiking.

4) The world's first paper money was created in China over 1,000 years ago.