Would you like to stay in an igloo? How about a railway car or a Wigwam? Perhaps a converted library or monastery is more your style. For those of us who love the unusual, there is Unusual Hotels of the World. You can stay in an underground cave, a floating boat, a tree house, a castle, a prison, a plane, or an ice hotel.
You can choose your hotel based on the wow factor, for creative and artistic merit, the sheer outrageousness, or the location or type of trip you desire; impress your partner with a romantic fantasy trip where you stay in an art gallery or a tree house in a rainforest. Staying in a church or a bullring will make your vacation memorable even if you do nothing else during your entire stay.
You may choose according to location, price, type of destrination, or wow factor, so decide what is most important to you, and choose wsiely.