1) The Great Barrier Reef in Australia is the largest living structure on Earth and can be seen from space.

2) The Bank of England, established in 1694, is the central bank of the United Kingdom and one of the oldest central banks in the world.

3) The world's largest diamond, the Cullinan, was discovered in South Africa in 1905 and weighed over 3,000 carats.

4) The Arctic Ocean is the smallest and shallowest ocean, located at the North Pole. It is covered by sea ice for much of the year.