1) The comedy group Monty Python, known for their surreal and irreverent humor, has had a significant influence on comedy and entertainment.

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

3) The world's oldest known living tree is a bristlecone pine named "Methuselah" in California, estimated to be over 4,800 years old.

4) The Eiffel Tower can be 15 cm taller during the summer due to thermal expansion.