Ever wondered what it would be like to spend a night in the cockpit of a Boeing 747? Or what about sleeping in a glass igloo?

From a hotel constructed of salt to tree houses in the Amazon rain forest, here are 12 of the most "unique and unusual" hotel stays from around the world, per travel site trivago.com.

Malmaison Oxford

Guests at the Malmaison Oxford in Oxford, UK,
Guests at the Malmaison Oxford in Oxford, UK, spend the night in a converted Victorian prison. The luxurious "cells" feature comfortable beds, plasma televisions, power showers and complimentary toiletries. (Credit: Malmaison Oxford)

Jumbo Stay Hostel

The Jumbo Stay Hostel in Stockholm, Sweden, allows
The Jumbo Stay Hostel in Stockholm, Sweden, allows guests to enjoy all the comforts and luxuries of flying first class without leaving the ground. The Boeing 747, previously in service for Pan Am and Singapore Airlines, is located on an unused runway at Stockholm airport. (Credit: Jumbo Stay Hostel)

Crowne Plaza Indianapolis Downtown Union Station

Spend the night in one of America's oldest
Spend the night in one of America's oldest railway stations at the Crowne Plaza Indianapolis Downtown Union Station. Guests will sleep in the authentic Pullman train car sleeper rooms and enjoy complimentary amenities such as eye masks, lavender spray, valet service, an indoor swimming pool and hot tub. (Credit: Crowne Plaza Indianapolis Downtown Union Station)

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Igloo Village Kakslauttanen

At the Igloo Village Kakslauttanen in Lapland, Finland,
At the Igloo Village Kakslauttanen in Lapland, Finland, guests can choose between staying in one of the individual log cabins, traditional snow igloos (sleeping on ice) or futuristic glass igloos (allow an unobstructed view of the night sky). The hotel offers rides by husky, reindeer or snowmobile, ice bar and the world's largest smoke sauna. (Credit: Igloo Village Kakslauttanen)

Martin's Patershof

Martin's Patershof in Mechelen, Belgium is a beautiful
Martin's Patershof in Mechelen, Belgium is a beautiful church dating back to the late 19th century, featuring high ceilings, archways and ornate embellishments. The hotel has been fully modernized although many of the church's features, such as mosaics and stained glass windows, are still intact. (Credit: Martin’s Patershof )

Queen Mary

Guests have the opportunity to stay aboard the
Guests have the opportunity to stay aboard the historical Queen Mary ship in Long Beach, Calif. This ship operated from 1937 to 1967 and totaled 1,001 transatlantic crossings. The hotel offers comfortable staterooms and suites with many of the original features in tact, such as wood paneling, original art work and operating portholes. (Credit: Queen Mary)

Treehotel

Designed by Sweden's leading architects, the Treehotel in
Designed by Sweden's leading architects, the Treehotel in Harads, Sweden offers spectacular treehouses with views of the Lule River. Designs range from the Bird's Nest and the UFO to the Mirrorcube. Guests can also enjoy snowshoe hiking and dog-sled riding to see the Northern Lights in the winter. (Credit: Treehotel)

Cappadocia Cave Suites

The Cappadocia Cave Suites in Goreme, Turkey give
The Cappadocia Cave Suites in Goreme, Turkey give guests the opportunity to stay in original cave dwellings from the Hittite, Roman and Byzantine periods. The cave system was converted into individual hotel rooms and feature free Wi-Fi, a mini fridge and complimentary tea and coffee. (Credit: Cappadocia Cave Suites)

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Palacio del Sal

In Uyuni, Bolivia, guests can spend the night
In Uyuni, Bolivia, guests can spend the night at the Palacio del Sal, or Palace of Salt, a unique hotel constructed from salt. The building is made from salt blocks as well as interior elements such as tables, chairs, beds and sculptures. The 16-room hotel features modern amenities, like private bathrooms, central heating and electricity. (Credit: Palacio de Sal)

Quinta Real

Spend the night at Quinta Real in Zacatecas,
Spend the night at Quinta Real in Zacatecas, Mexico and you'll be staying in a hotel built into the famous San Pedro bullfighting ring. Constructed in the 19th century, the hotel retains all the character of the original bullring while offering guests luxury amenities. (Credit: Quinta Real )

Ariau Amazon Towers

In Manaus, Brazil, the Ariau Amazon Towers allow
In Manaus, Brazil, the Ariau Amazon Towers allow guests to stay in the heart of the Brazilian Amazon rain forest 110 feet high in the tree tops. The hotel features more than six miles of canopy walkways and bedrooms featuring modern conveniences such as high-speed Internet, a fitness center and two treetop swimming pools. (Credit: Ariau Amazon Towers)

Icehotel

The Icehotel in Jukkasjarvi, Sweden is built up
The Icehotel in Jukkasjarvi, Sweden is built up anew each winter and melts away in the spring (open only Dec.-April). The hotel provides sleeping bags (single or double) to those who choose to brave the cold in a room made entirely of ice. (Credit: Leif Milling. Sculptor: Czajkowski & Eryk Marks)