1) The world's largest volcano, Mauna Loa in Hawaii, is also one of the most active. It stands over 13,000 feet (4,000 meters) above sea level.

2) The ancient city of Rome was founded in 753 BC and went on to become one of the most powerful and influential civilizations in history.

3) The national animal of Australia is the kangaroo.

4) The NBA (National Basketball Association) is widely regarded as one of the most popular and competitive professional basketball leagues in the world.