The De Vrouwe van Stavoren Hotel in the Netherlands salvaged four wine casks from Switzerland and converted them into rooms. Formerly filled with 14,500 liters of Beaujolais wine from the French chateau, each now holds a modest two-person room with standard amenities and even an attached bathroom and sitting room. Visitors from all around the world have traveled to the quaint northern port town of Stavoren to stay in one of these upcycled rooms.
Many of us have heard, seen or been in the Tiny hotel rooms of Japan. They are basically just a 10x5x5 cube that you can rent for $45, which is a steal for Japan. I found this Tiny Hotel to me a bit more aesthetically pleasing. This is a single room in Germany.
I have once been in one similar in Austria, it was amazingly comfortable and had its own bathroom and shower! A little tip for when you are traveling and trying to save a a few Euros; The bathroom is considered a luxury and you can ask if they have rooms without bathrooms, this will save you about 10 to 25 Euros! The downside is of course that you have to shave a bathroom down the hall, but its worth it. Of course there are hostels too, which I highly recommend, but do your research. Anyway, back to the Tiny Hotel, check out this room and compare it to one you would find in America.