1) In Greek mythology, the Trojan War is a legendary conflict between the city of Troy and the Greeks, sparked by the abduction of Helen of Troy. It is immortalized in Homer's epic poems, the Iliad and the Odyssey, and features famous heroes like Achilles, Hector, and Odysseus.

2) The musical "The Phantom of the Opera" has been running in London's West End since 1986, making it the longest-running musical in history.

3) The Great Wall of China is not visible from space without aid, contrary to popular belief.

4) The Age of Exploration, during the 15th and 16th centuries, saw European explorers such as Christopher Columbus and Vasco da Gama reach new lands and establish trade routes.