Apologies for second post, I forgot to mention quite a few strong candidates in my first post...
Torre de Belem
https://en.wikipedia.org/wiki/Belém_Tower , a legacy from the colonial period indeed.
The Crystal Palace
I believe there is no need for an introduction… Right?
University of Al Quaraouiyine
https://en.wikipedia.org/wiki/University_of_Al_Quaraouiyine , the oldest university in history, besides, the architecture is excellent.
Kew Garden
https://en.wikipedia.org/wiki/Royal_Botanic_Gardens,_Kew , as a RHS member, I have to say by all means it is the best garden humans have ever produced. also, the wide range of species presented in it also represents the oversea empire Britain use to have.
The Shaolin Monastery
https://en.wikipedia.org/wiki/Shaolin_Monastery , I know many people might think it does not deserve the title of wonder, to be honest it is occupied by a group of fake monks who value their commercial interest over their cultural heritage for now, but still, it is an interesting choice, and it does have at least some impact on Chinese Buddism and todays’ Hollywood film.
The Potala Palace
https://en.wikipedia.org/wiki/Potala_Palace , a extraordinary building which built on the most impossible place, the greatest architecture achievement in Tibet, also, its link with tundra suits the current wonders on tile system.