There are many, many wonders missing on that list, but alright:
The "I cannot believe these are not included in the vainilla game, their inclussion is self-explanatory" tier:
- Macchu Picchu
- Taj Majal
- Angkor Wat
- Statue of liberty
- Borobudur
The "truthly underrated" tier:
- Churches of Laibela. Come one, subterranean churches carved into the ground, how cool is that? And it is an African wonder, to boot!
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The Empire state building. The tallest building of the world for a long time, it is still an icon of NYC even nowadays despite of being surrounded by shinier, taller skycrappers. I would be cool with replacing the Empire State with the Chrysler building, though
The "not present in the poll, needs to be in the game someday" tier:
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La Sagrada Familia Cathedral. Why should the past hold all the religious wonders? La Sagrada Familia is probably the latest, most modern "wondrous" cathedral in the world, an icon of Barcelona, and a true marvel to behold
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The Large Hadron Collider. This is the biggest piece of machinery ever built by mankind, it spans trought 3 different countries and it is helping us to understand the fabric of the goddamn universe itself. How is this not a world wonder yet?
- Hollywood. Probably, one of the biggest cultural institutions of the world, its influence at creating the modern cultural industry is undeniable
- Nan Madol. Come on, this wasn't a city state. It was an incredible, wondrous ceremonial complex built in the middle of the sea by unkown methods (a mystery that some compares to the construction of the Pyramids), and it deserves every big of its status as a world wonder
- Gobekli Tepe. This is one, if not THE most important building in the history of mankind. The very first monument ever crafted by human hands, it kickstarted our veer into sedentarism, and thus, into civilization itself. Just for you to have an idea of how much important this was, some people has even proposed to make our calendar start on the building date of this temple