Upside Down - Propeller Island City Lodge, Berlin

The rooms are created by German artist Lars Stroschen with the aim of altering guests' perceptions, something this "upside-down" room certainly achieves.

Two Lions - Propeller Island City Lodge, Berlin

The hotel offers themed abodes ranging from the tame to the extreme. The Two Lions room, complete with cages, has a two-way mirror into the next room for real exhibitionists.

Gruft - Propeller Island City Lodge, Berlin

Deep sleepers should perhaps avoid the Gothic beds at this unique hotel in Berlin – or just opt for a less terrifying bed in the "labyrinth" part of the room below.

Hostel Celica, Ljubljana, Slovenia

Travellers who want jailtime without compromising their sense of style should also check out the clean lines (well, there are lots of bars) at this converted prison in Slovenia.

The Old Jail, Mount Gambier, South Australia, Australia

Independently minded travellers who yawn in the face of "bright, airy and spacious" should check out this budget hostel.

Das Park Hotel, Linz, Austria

Who would have thought concrete could be comfy? These renovated sewage pipes are, thankfully, clean and functional and sit on the banks of the Danube, making them a perfect post-industrial bolt hole.

The Dog Bark Park Inn, Idaho, USA

Sleeping in the doghouse is no bad thing at this bed & breakfast, imaginatively set inside a 12ft beagle. Created by a pair of "chainsaw artists", the lodgings benefit from a cozy alcove in the dog's muzzle.