[2020] A roller coaster with looping in Anno 1800?

While they were certainly not common place (then again, neither were World Fairs!), the concept also wasn't unheard of, as pointed out by others in the thread already (though the implementation in the game is indeed a bit "futuristic"). But, as we always, it needs to be stressed that Anno does not try to be historically accurate, and we are happy to stretch historical facts if they get in the way of our gameplay ideas (like using airships for Arctic exploration).