Cave
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We tend to think of future lunar colonies as being cramped futuristic domes or subsurface rabbit warrens, but what about underground caverns big enough to hang glide in? According to a study by a Purdue University, the Moon may contain lava tubes large enough to house entire cities.
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The Mega Underground Bike Park isn't just some warehouse-style bike park. Claimed to be the largest indoor bike park in the world, it's situated 10 stories (100 ft/30.5 m) underground in a disused limestone mining cavern.
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A Vietnamese resort company has been granted approval to begin surveys to build a 10.6 kilometer long cable car in the world’s largest cave, the UNESCO-listed Son Doong in north-central Quang Binh province in Vietnam.
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The old Blaenau Ffestiniog slate mine in North Wales is soon to become the home of the world's largest underground trampoline. Set to open on Friday, Bounce Below is the newest attraction to the Zip World theme park.
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Switzerland's Peter Kunz Architektur is responsible for the creation of a modern day “Batcave”-style garage.
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Deep within the dark tunnels and cavity shafts of an old Swedish silver mine, guests can sleep in the world's deepest hotel suite.
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An underground atomic shelter has been transformed into an internet provider's HQ.
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Hidden amongst ancient caves in Cappadocia, Turkey, you’ll find Yunak Evleri – a 5 star hotel, boasting six cave houses dating back to the 5th and 6th Centuries.
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A home entertainment enthusiast 'Down Under' in Melbourne, Australia, has built a unique home theater - his very own Bat Cave replica.