This Citadel house or apartment complex is designed by Dutch firm, Waterstudio. The Citadel is the world’s first floating apartment structure designed in an effort to combat rising water levels. The project is directed by Koen Oithuis. The house will house 60 luxury apartments. Can’t imagine how fun it’d be to live in one of these, but what happens if you can’t swim and you sleep-walk? Lol. Just a thought!