Yes and no, you gotta remember too as far as architecture is concerned, besides the Christ the Redeemer statue and soccer, there isn't much else noteworthy coming out of Brazil except giant groups of people, and their money.
Google Brasilia or Oscar Niemeyer. They built the capitol city from scratch in the late 50's and features some of the finest examples of modern architecture in the West. Imagine am exhibit or restaurant inside a recreation of the Catedral, it would be breathtaking. Between Rip, Brasilia and the rainforest, I think there's plenty to make a visually stunning pavilion. Any rides/attractions, though, and I have no idea. Something in the rainforest, probably.