Idk if this is truly a wonder, but when I heard about it earlier this year I was stunned by how magnificent it looked. NJ opened the largest Hindu temple outside of Asia last fall. It looks crazy.
Also pretty sure theres a church in Spain that is still being built that was started in the 1500s or some shit and is in the exact same style of gothic architecture as shown above.
The Sagrada Familia, yeah. It's... pretty big, they're hoping to finish it in the 2030s.
(Construction started in the 1800s though, maybe there's an even older one idk about?)
There's a shockingly large, beautiful one in my hometown of Pearland, Texas - the Sri Meenakshi Temple.
It was only the third Hindu temple built in America, and, at least when it was built, it was the only Meenakshi temple outside of India. It's still a venue for high-profile Hindu weddings.
When it was built, Pearland was a mostly-rural community with a population of about 10,000 (2020 census is around 120,000), and they built this phenomenal temple in the middle of nowhere on McLean road.