No way man! Look the name of thing is UNIQUE BUILDING, right? Where in the world there is a Sambódromo? Just in Brazil! So it is a Unique Building. I really dont understand why brazilians act like this. Its our culture, just like the other nations have is own, and they usualy dont ashame of it. You dont see americans complaining about their traditions or culture. They may not like it between them, but for foreing people, any american will say that their culture is the best of the world. Anyway...
Sambódromo is our unique building. Is a celebration of our most important holyday, the Carnaval! There is no Carnaval like brazilian one in the world. Thats why our unique building should be this one. Also, Brazil is a young country just like US. The units and buildings should reflect this.
By the way, for thouse who are not from Brazil, a Sambódromo is a place where brazilians celebrate the carnaval. Its like a healty competition between samba schools, where all the members dress funny clothes and go dancing following a samba singer, which is called "Puxador". In some citys (Specialy Rio de Janeiro and São Paulo) this is very popular and serious.
There is also a another kind of Sambódromo on the states in the middle of Amazon area. There the Sambódromo is called Bumbódromo and are only two schools, which is represented by blue and red colors. They celebrate a another cultural caracter of brazilian fairytales, the "Boi Bumba" (Its a kind of Magic Cattle).
The most famous sambódromo of the world is "Maquês de Sapucai" on Rio de Janeiro.
If there are three things that Brazil is known in the World, is the soccer, the beachs or the amazon rain florest and the Carnaval. Thats why I think, the Sambódromo is the Unique Building that can fits to Brazilian Civilization.
On Unique Units, there are only two avaiable. The Dragão da Indepêndencia, or the Pracinha. Astro is not that kind of Unique, because rocket launchers exist since second world war (The legendary Russian Katyusha), the Super Tucano also arent, since its a mod of 2ww fighters. Osório could be a option IF wasnt dead on his birth. And the amazon special combat unit, of brazilan army is not a "Unique Unit" like American Marines for exemple.
I vote for the Dragões, because the Pracinhas also arent a special unit from brazilian army. They were regular soldiers that was sended to the war on the brazilian expedicionary force, to fight the nazis on the Italy. Its a quite diference between a special force, special trained as a top military unit of all nation army. The Dragões da Indepêndencia at there time on the 19th century was. Today they are decorative, but at that time they were the top of "military" force of Brazil.