This is truly aggressive upcycling:

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.

(images, story via Inhabitat)