There are a lot of unique luxury hotel ideas available today. You could stay in the tallest hotel in the world, or a luxury caravan in Kent. These are located throughout the world where they can be enjoyed by lots of different people. Some of them do tend to stand out a lot more than others though.
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The Burj Al Arab Hotel
Located in Dubai this is a luxury hotel that's designed to imitate a ship's sail. It's also the second tallest hotel in the world today, standing 28 double-story floors high with 202 suites. The hotel contains a large seawater aquarium and is connected to the mainland via a private, curving bridge.
Kakslauttanen, Saariselk, Finland's Igloo Village
The Igloo Village is part of Hotel Kakslauttanen in Finland. There are both traditional and futuristic igloos available for you to stay in. They allow you to enjoy snow sights, as well as the northern lights while under a glass ceiling in a warm room.
Das Park Hotel
In Linz, Australia you'll find the Das Park Hotel, which is Andreas Strauss' idea. She redesigned sewer pipes so as to create unique, individual hotel rooms each of which has its own lights, double bed and a code lock. There are also toilets, showers, a mini bar and a cafeteria available on the hotel grounds. Things like electricity are purchased on a "pay as you go" plan.
In rural Somerset you can enjoy staying in a beautifully restored gypsy bow top wagon. While this may be a luxury holiday you'll still be surrounded by ponies, donkeys, chickens, sheep, pigs, and cats on the outside. On the inside you'll enjoy great Romany interior. In the evening you'll enjoy sitting on the caravan's steps watching the fire's embers and looking at the apple orchard.
If you're willing to take some time to look around, you're bound to find some very unique vacation destinations that will be quite enjoyable for you. Of course, these are just a very small sampling of what is available. You may also enjoy staying in a hut in a desert, visiting the Liberty Hotel in Boston, or just simply traveling around using sleeper trains accross Europe.