Background: Designer Antti Lovag long rebelled against traditional structures, and the Bubble Castle is a perfect example of his radical approach to rethinking the built environment. The bulbous compound sits on the southwest coast of France. Why Its Unique: There are no sharp angles or straight lines in this unusual design. Lovag unified the home with its natural surrounding by bringing outdoor elements inside, including palm trees and a waterfall. This home is incorporating these outdoor rock croppings in a way that links them to the overall bubble concept, Koliopoulos says. The house has already been deemed a historic monument by Frances Ministry of Culture, despite the fact that its not even 50 years old.