Sleep in a concrete tube. The idea of Andreas Strauss and first created as DasParkHotel in Ottensheim, Austria these concrete tubes provide basic hospitality, on a pay-what-you-wish basis. Constructed from 9,5 tonne concrete drain pipe sections they are cool in summer and warm at the end of season. They're simple - but functional, and a great bet if you're cycling or want a change from camping.
Surprisingly comfortable, they have a full head height interior, double bed, light, power, blanket and light cotton sleeping bag. All other facilities are provided locally.