1) The Mona Lisa, painted by Leonardo da Vinci, is one of the most famous and valuable artworks in the world.

2) The Great Barrier Reef in Australia is the largest coral reef system in the world and is visible from space.

3) In African mythology, there is a rich tapestry of diverse beliefs and stories across the continent's many regions and cultures. It includes deities, spirits, and mythical creatures, with narratives often addressing themes of creation, ancestral heritage, and the forces of nature.

4) The sitcom "Friends" is known for its iconic Central Perk coffee shop, where the main characters often gather.