Weird Hostels

I was surfing the Web today reading about weird hostels. Here are some of the weird or unusual hostels that I found. Maybe they can provide inspiring concepts for new hostels.

(Add more if you know of them)

Castle Hostels
* Carbisdale Castle in Scotland
* Stayokay Domburg in Netherlands -- a hostel in Castle Westhove (13th century)
* Foulksrath Castle - Kilkenny Hostel, Ireland -- a Irish hostel in a 16th century castle
* Albergue Lua Cheia -- Castle hostel in Natal, Brazil
* Burg Breuberg -- Castle hostel in Germany. I couldn't find much information about it in English.

Boat Hostels:
* Eastern Comfort in Berlin -- a hostel on a boat
* Red Boat Mälaren in Stockholm, Sweden -- a hostel located on two boats in Stockholm
* Hostel Boat The Clipper, Rotterdam -- a hostel boat in the Netherlands. The Web site is down, but I will link to it when it goes back up: hostelboat.nl
* af Chapman -- a boat hostel in Stockholm, Sweden
* Nyhaven Boat Hostel in Copenhagen, Denmark

Treehouse Hostels:
* Bayram's Treehouse Hostel, Turkey

Prison Hostels:
* Långholmen Hostel in Stockholm, Sweden -- former prison offering "...freshly renovated, prison cells in what used to be the Crown Prison".
* Ottawa Jail Hostel -- A Canadian hostel in a former jail -- offering dorm cells.

Cave Hostels:
* Traveller's Cave -- dorm beds in a cave, Goreme, Turkey

Ranch Hostels:
* Anak Ranch -- Stay in a ger (yurt) on a Mongolian working ranch. Directions to get there: "The train arrives in Orkhon at about 3 a.m. We are met at the station with horses, and then it’s a 20-minute ride to the ranch."

Please list more below if you know of them...