The Citadel is a floating apartment complex designed by Dutch architect Koen Olthuis of Waterstudio. Seasickness should be no problem as the complex of 60 luxury apartments (plus car park) will float on a massive concrete foundation that is designed to remain perfectly stable as the water rises and falls.

Cooling is assisted by water pumped from submerged pipes, a system which is said to cut as much as 25% from electricity bills. [Popgadget]

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