I guess I'm partial to the Parthenon. I was amazed at the workmanship and hard labor it must have took to build such a beautiful building. Super architecture! What it must have looked like in ancient times is mind boggling.
Duomo di milano ♥
The Eiffiel Tower
I guess I have modest tastes. I like the Bridge over Bixby Creek.
I'm just going to add an answer from me in it even though i was the one that asked the question in the first place. I have so many favourite places but I do like Trevi Fountain. It may not be your favourite piece of architecture but is still pretty amazing.