1) The construction of the Great Wall of China began in the 7th century BC and was completed over several centuries, spanning thousands of miles.

2) The first bank in the world, Banca Monte dei Paschi di Siena, was established in Italy in 1472 and is still in operation today.

3) The Great Barrier Reef in Australia is the largest coral reef system in the world and is visible from space.

4) The word "triangle" contains four vowels: I, A, E, and E.