1) The national flower of Japan is the cherry blossom, which holds great cultural significance and is celebrated during the annual cherry blossom festivals.

2) Cricket, originating in England, is a popular sport played in many countries and is known for its distinctive rules and terminology.

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

4) The concept of sovereignty refers to the supreme authority and power of a state to govern itself, make decisions, and control its own territory without interference from external forces.