Wanted wonders: Tower of London, Lindisfarne, Cluny Abbey, Alhambra palace, Mezquita Mosque/Cathedral of Cordoba, Monte Cassino monastery, Mount Athos monastery, Acropolis ruins in Athens, Kaaba in Mecca, Wailing Wall / Temple of Jerusalem / Dome of the Rock, Nidarosdomen.

It looks like Central & Eastern Europe gonna miss all fun again...
But not on my watch!
There were at least few wonders, for example:
Golden Gate, Kiev, 1017 https://en.wikipedia.org/wiki/Golden_Gate,_Kiev
Novgorod Detinets, Novgorod, 1044 https://en.wikipedia.org/wiki/Novgorod_Detinets
Ruins of Chersonesus, Cherson, 6BC https://en.wikipedia.org/wiki/Chersonesus
Prague Castle, Prague, 870 https://en.wikipedia.org/wiki/Prague_Castle

The Mainzer Dom might be an interesting addition. I believe it's also built in the 790's, though it's been damaged and rebuilt so many times that getting a proper historically accurate image might be hard. I don't know if Irminsul could also be a wonder.

- Ypres Cloth Hall. It was one of the biggest commercial buildings in the middle ages where cloth was quality approved and traded. I always hated the lack of historical buildings in the County Of Flanders in CK2. Bruge, Ghent, ... all were known for their lace and cloths during the middle ages.
They were one of the biggest exporters to the UK etc... The wiki page gives more details.
The building started in the 1200s and ended in 1304 en.wikipedia.org/wiki/Ypres_Cloth_Hall

- The remnants of the Roman Walls in Tongres (Belgium) (Built in +- 30 AD). Those remnants are still here today so I imagined they would have been less worn down back in the 700s. I think it would be a nice idea to create those walls as a stage 1 wonder with almost NO effects. They need to be upgraded / repaired to be of use. There are still some old towers halfy erect today so the upgrades could involve adding/repairing the south/east/west/north towers. Historically it would have been located within the county of Liege. Tongres used to be a major Roman town. There were aquaducts, temples, tumuli etc all over the place. It's a shame none can be restored or built in ck2...
https://en.wikipedia.org/wiki/Tongeren -> the first point under history shows the walls today and gives some info.

Links to various suggestions (note: Many of these share the same location):
https://en.wikipedia.org/wiki/Church_of_the_Holy_Sepulchre
https://en.wikipedia.org/wiki/Domus_Aurea
https://en.wikipedia.org/wiki/St._Peter%27s_Basilica
https://en.wikipedia.org/wiki/Parthenon
https://en.wikipedia.org/wiki/Windsor_Castle
https://en.wikipedia.org/wiki/Great_Mosque_of_Djenn%C3%A9
https://en.wikipedia.org/wiki/Lighthouse_of_Alexandria
https://en.wikipedia.org/wiki/Notre-Dame_de_Paris
https://en.wikipedia.org/wiki/Castel_Sant%27Angelo
https://en.wikipedia.org/wiki/Edinburgh_Castle
https://en.wikipedia.org/wiki/Palais_des_Papes
https://en.wikipedia.org/wiki/Al-Masjid_an-Nabawi
https://en.wikipedia.org/wiki/Great_Mosque_of_Mecca
https://en.wikipedia.org/wiki/Red_Fort
https://en.wikipedia.org/wiki/St_Mark%27s_Basilica
https://en.wikipedia.org/wiki/Louvre_Palace
https://en.wikipedia.org/wiki/Cothon
https://en.wikipedia.org/wiki/Saint_Basil%27s_Cathedral
https://en.wikipedia.org/wiki/Palace_of_Versailles
https://en.wikipedia.org/wiki/Moscow_Kremlin
https://en.wikipedia.org/wiki/Bastille
https://en.wikipedia.org/wiki/Cologne_Cathedral
https://en.wikipedia.org/wiki/Statue_of_Zeus_at_Olympia
https://en.wikipedia.org/wiki/Medina_Azahara
https://en.wikipedia.org/wiki/Temple_at_Uppsala
https://en.wikipedia.org/wiki/Mausoleum_at_Halicarnassus
https://en.wikipedia.org/wiki/Saint_Sophia%27s_Cathedral,_Kiev
https://en.wikipedia.org/wiki/Colossus_of_Rhodes
https://en.wikipedia.org/wiki/Tower_of_London
https://en.wikipedia.org/wiki/Hampton_Court_Palace
https://en.wikipedia.org/wiki/Obelisk_of_Axum
https://en.wikipedia.org/wiki/Potala_Palace
https://en.wikipedia.org/wiki/Taj_Mahal
https://en.wikipedia.org/wiki/Palace_of_Aachen
https://en.wikipedia.org/wiki/Westminster_Abbey
https://en.wikipedia.org/wiki/Palace_of_Westminster
https://en.wikipedia.org/wiki/Library_of_Alexandria
https://en.wikipedia.org/wiki/Jelling_stones
https://en.wikipedia.org/wiki/Ranganathaswamy_Temple,_Srirangam
https://en.wikipedia.org/wiki/Leaning_Tower_of_Pisa
https://en.wikipedia.org/wiki/Iron_pillar_of_Delhi

The Malbork/Marienburg castle. Largest castle ever built, to my knowledge it was never conquered by force. I suppose it could give a nice, fat bonus to fort level and garrison size, while also adding a wonder to central/east Europe, which is lacking in that department.

https://en.wikipedia.org/wiki/Malbork_Castle

Marienburg would be nice, I agree. Tevton gang Rise up

It would be nice if you could add the Bamiyan Buddhas
https://en.wikipedia.org/wiki/Buddhas_of_Bamyan

Hello. I believe it would be a good idea to add the Moscow kremlin.

It was built a tad bit after the game ends but it isn't too far off so I do not believe it is horribly inaccurate. The kremlin is a very important religious, political and cultural landmark so I believe it would be a great addition.

Another good addition that isn't quite as historically accurate is St. Basil Cathedral. It is from about 100 years after the game of ck2 ends but is a very infamous Russian landmark.

https://en.wikipedia.org/wiki/Moscow_Kremlin

https://en.wikipedia.org/wiki/Saint_Basil's_Cathedral

Church of the Holy Sephulcre in Jerusalem

Hadrian's Wall in Scotland could be a good addition. It could start off at the lowest level and perhaps also be destroyed meaning you would have to rebuild and restore it yourself with a nice prestige and defence bonus. I think the land that actually takes up the wall in game is made up of only a couple of tiles too so you could have Hadrian's wall West and Hadrian's Wall east.

parthenon of athens