The Greek conquest of much of the western world in the 4th century BC gave travellers access to the civilizations of the Egyptians, Persians, and Babylonians who began to list what they saw to remember them.

The list was  put together in popular poems in the 2nd c entury BC. 

Use the following links to find information about The Seven Wonder of the Ancient World

https://www.history.com/topics/ancient-history/sevens-wonders-of-the-ancient-world

https://www.thoughtco.com/the-seven-wonders-of-the-world-4147695