These sites were chosen by a Swiss foundation through online polls in the early 2000s. They are one of many lists of seven (or more) wonders.
I agree that there are many wonderful things in the world -- maybe even more than eight. I am asking about sites from this list, not all wonderful things.
There is a Wikipedia article about the New Seven Wonders of the World (TM) and another about wonders lists in general:
https://en.wikipedia.org/wiki/New_7_Wonders_of_the_World?wprov=sfla1
https://en.wikipedia.org/wiki/Wonders_of_the_World?wprov=sfla1