In a prison, igloo, tree house, top of a mountain or under the stars. what's the next stop? Architecture and leisure meet in this glimpse of the craziest places to stay while on the road. The new ideas, transformed spaces and new interpretations of lodging in Extreme Hotels all prioritize fun. Each hotel is described in terms of its architectural and design ingenuity placed in context on a map of Europe and introduced with key contact and informational details.