The world's wildest hotels: Inside the most extraordinary places to spend the night - from a 'UFO' to old jail cells

From hotel rooms inside old jails to cliff-face suites that will have your heart palpitating, accommodation is becoming far more interesting than the classic resorts most of us associate with holidays.Now, a heart-shaped resort is on the cards in Las Vegas, perfect for any romantic trips.Permits for the hotel were approved for the long-abandoned SkyVue Ferris wheel site in the city to become a 29-storey hotel tower with a heart-shaped opening and entertainment centre. The new heart hotel is planned to have an LED facade, outdoor recreation area and restaurants and retail offerings in frontBut for quirky hotel fans, it's not your only option for a one-of-a-kind break.Here are some of the world's craziest, most bizarre and more unusual hotel designs.Sky Lodge Adventure Suites, Peru Sheer drop: Sky Lodge Adventure Suites in Peru are not for the faint-heartedDo transparent capsules off the side of a cliff sound like fun to you – or hell?If it's the former, take a look at the Sky Lodge Adventure Suites located in the Sacred Valley of Cuzco, Peru. They are bookable from around £340 a night.A hanging bedroom allows you to be totally immersed in the scenery. Suspended 1,200ft in the air, you access your room via a climb or a zip line. If you suffer from vertigo, it might be better to look elsewhere... Treehotel, Sweden Wood you believe it? Treehotel in Sweden reimagines the treehouse in modern termsAt the Treehotel in Harads, unique treehouses are placed high up in the pines – a veritable childhood treehouse but with a modern, adult twist. Accommodation ranges from a mirrored cube and a bird’s nest to a ‘floating’ domed UFO. All have minimalist Scandi-chic interiors, perfect for those looking for something out of the ordinary – with a price tag to match. Suites start from £1,543 for two people per night. UFO Hotel, Wales UFO-my goodness! Melin Mabes, home to a UFO-themed accommodation, also houses a real-life treehouse and traditional gypsy caravan letReady to hit the mute button on reality? Deep in the Pembrokeshire countryside lies a cosmic retreat that feels almost light years away from Earth.The awe-inspiring Spodnic UFO is one of three standout stays at Melin Mabes, a four-acre glamping site owned and run by Martin Johnson and his wife, CarolAnne.It has been transformed into a glamping retreat with three unique stays in a UFO, real-life treehouse, and an old gipsy caravan.But the spacecraft-themed pod is especially captivating as it's been designed to look as though it has landed straight from outer space – with three tripod legs, a drop-down door, NASA-designed interiors and colour-changing lights.In order to make the UFO look more lifelike, Martin turned the pod's hinged door into a drop-down entry point using a simple wheelchair lift.The walls are fitted with multiple layers of insulation foil originally designed by NASA, while decor consists of blow-up alien dolls, alien-themed cushions, spacesuits, astronaut helmets, black and yellow hazard tape, and cages of 'exposed' wiring. Katara Towers, Qatar Qatar Crescent: Katara Towers is a glamorous building in the Middle East Katara Towers, made up of two traditional crossed swords and looking like a crescent, is one of the world's most ingenious designs.Located in Qatar and completed in 2022, it houses the Lusail Katara hotel in the Lusail Marina district, with an area of over 48,000 square metres and a height of 36 storeys.Inside are two of the world’s most prestigious hotel chains, Raffles and Fairmont.There are also apartments, offices, commercial shops and restaurants.Sheraton Huzhou Hot Spring Resort, Huzhou, China Horseshoe hotel: The Sheraton Huzhou Hot Spring Resort, Huzhou, China has a unique shapeHorseshoe-shaped Sheraton Huzhou Hot Spring Resort has 27 stories with views over the waters of Tai Lake.It's certainly a luxurious stay – it has a spa, an infinity pool, a private beach and a custom wedding island that extends into Tai Lake. One visitor wrote of the hotel: 'I had a wonderful, splendid time at the hotel. I had a wonderful room and felt so relaxed and happy after a stressful week. Many thanks to the staff at the front desk, room service, house cleaning and restaurant.'Rooms start from £105. WC Beautique Hotel, Lisbon Boutique bathroom: Lisbon's WC Beautique Hotel has a toilet themeA bathroom is not the most conventional source of inspiration for a hotel – but why not?This Lisbon property takes its theme and runs with it. Expect modern rooms, blues and greens everywhere you look.Staff even wear pyjamas, adding to the relaxed bathroom theme.'This is such a cool quirky and comfortable hotel,' one visitor wrote. 'The rooms are super cool and modern. All the gadgets and extras you get are a nice touch to the rooms. The smell throughout the hotel was lovely and the theme and attention to detail is perfect.'Rooms start from £74 per night.Crane Hotel Faralda, Amsterdam Lifting you higher: Three luxury suites can be found at the top of a monumental Amsterdam craneAcross the River IJ from central Amsterdam is Faralda. It's a crane hotel in the trendy NDSM neighbourhood, a former shipyard that's become an impossibly cool place to stay.There are three luxury suites that have been stacked on top of each other and fitted to the interior of the crane, 50m above ground. There’s also a panorama lounge and hot tub on the top deck. There are no stairs or ladders – you'll need to take a lift up to your bedroom for the night. Bodmin Jail Hotel, Cornwall Boo! Bodmin Jail Hotel, located in Cornwall, is one of the UK's best-kept secrets: a former prison, it is now home to a luxury retreat with a twistRetaining its historic intrigue, this unique escape now offers indulgent comfort within its atmospheric walls. The jail opened for the first time in 1779, and could house more than 200 prisoners, with up to eight in a cell. The prison closed in the 1920s, before falling into disrepair. After it was repurchased, planning permission was granted in 2017 – and the building was almost completed by the end of Covid.Nowadays, the imposing hotel has two main wings, each housing a central atrium with four floors, leading to 70 rooms. The rooms, also featuring living areas and bathrooms, add a touch of modernity while retaining the charm of the historic building. Each of the bedrooms comprises three former cells – so there is no shortage of space here.The chapel, used by former prisoners, is now a restaurant, while the library functions as a lounge – and there's even a gym in the basement.There are rumours of hidden rooms and tunnels that lead nowhere, often drawing in keen tourists.Icehotel, Jukkasjärvi, Sweden Ice, ice, baby: For a wintery wonderland trip, try the Icehotel in SwedenAdorned with glistening artwork and only built for a few months before it melts away, Sweden's Icehotel is located in Jukkasjärvi and boasts 12 suites, decorated by 33 different artists from around the world, and between 15 and 20 ice rooms.When guests enter the hotel, they are greeted by the 30-metre-long Main Hall, Cathedral Grove, which consists of a shimmering forest of icy treetops. The hotel also has a Ceremony Hall where couples can wed surrounded by beautiful snow and ice. The ice rooms are around minus five degrees and guests wrap up in reindeer skins and a sleeping bag as they sleep surrounded by sparkling ice. Hotel Marqués De Riscal, La Rioja, Spain Modern art madness: The Hotel Marqués De Riscal is an avant-garde designExperimental architect Frank Gehry's avant-garde design blends colour, strange shapes and more, aiming to represent a ribbon wrapped around a gift.The five-star hotel is situated in the heart of the Spanish winelands of Elciego in the La Rioja region.With 43 luxury suites and rooms from £565, it's a bougie gift for a wine lover – explore expansive vineyards from your quirky surroundings.The Hobbit Motel, Woodlyn Park, Waitomo, New Zealand My precious: Fan of The Hobbit? This stay might be for you If, like Bilbo Baggins, you want to go on an adventure, this New Zealand resort is a quirky solution to your travelling woes.The Hobbit caves are cute, cosy and perfect for a one-of-a-kind stay. One visitor said: 'If you're staying in Waitomo and want a unique visit, this should be the only place you go to. We chose to stay in the Hobbit "cave room" because we just left the shire and wanted to stay in the closest thing to a Hobbit hole. 'The property is adorable, the owner has a cute dog that walks around the top of the hill. This place is awesome.'Costa Verde, Manuel Antonio National Park, Costa Rica Time for take off! Stay inside an abandoned plane at Costa VerdeMost associate planes with travelling to their destination – not the accommodation itself.But at Costa Verde in Manuel Antonio National Park, a vintage 1965 Boeing 727 airframe is on hand to actually house you during your trip.Salvaged from its San Jose airport-resting place, it is perched on a 50-foot pedestal with scenic ocean and jungle views.It's furnished with hand-carved teak furniture from Indonesia, and has two air-conditioned bedrooms to stay in. A night's stay starts from £340.The Bus Stop, East Lothian, Scotland A real bus stops: Tucked deep in the East Lothian countryside, just 40 minutes from Edinburgh, is a glamping experience that redefines rural luxury - with a twist.At The Bus Stop, guests not only arrive to the remote site in vehicles, they sleep in them too. Visitors can 'unplug naturally' at any of nine fully converted single and double-decker buses, which include self-catered stays ranging from rustic glamping to high-end luxury. Set across nearly 200 acres, the single-deck buses offer an 'off-grid' experience in their own private area, with burning indoor stoves, fairy lights and solar panels, while the main grounds feature three luxury buses.Among them is a retired 20-year-old double-decker, which once shuttled passengers through the streets of Newcastle and Edinburgh.Each bus features central heating, a private kitchen, and a bathroom.