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) Michael Jackson's album "Thriller" is the best-selling album of all time, with estimated sales of over 66 million copies worldwide.

4) The first photograph of a black hole was captured in 2019 using a network of telescopes around the world.