How about booking a stay at these rooms that were made from unused sewer pipes? If so, check into Das Park Hotel in Austria.
Maybe a capsule room when you stay in Japan?
A refurbished 1965 Boeing 727 airframe is now part of the Hotel Costa Verde in Costa Rica. I wonder if the bathroom is teeny-tiny?
The '70s-era escape pods make up the traveling Capsule Hotel in The Netherlands. Red-Alert not included.
The four enormous casks on the grounds of the Hotel de Vrouwe Van Stavoren in The Netherlands once held almost 20,000 bottles of wine. I bet the room has an oakey flavor (easy pun, sorry).
I'd totally stay in a chocolate hotel. Wonder if there is one somewhere. For more go to Unusual & Unique Hotels of The World
Hyde, K. (2008). The Vacation Flexibility Index: A Measure of Independence in Vacationer Behavior Tourism Analysis, 13 (5), 437-444 DOI: 10.3727/108354208788160423