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I wish to know what the the most isolated building in the world is, with "most isolated" being defined as "the longest distance to the closest building". Building complexes count as multiple buildings. A building is defined as any permanent man made structure that is used either for habitation or human activities. So this includes houses, office buildings, fixed rocket launch sites, military bases embedded into mountains,... Essentially everything apart from walls and other fortifications, small outdoor sheds not meant for living or working like outhouses or storage sheds and wells. For example: the Svalbard seed vault is considered a building, BUT it lies a couple hundred meters from the Svalbard airport, so it's not the most isolated building in the world.


Clarifying the comments: (Ant)Arctic research stations count as multiple buildings if they're modular like Halley VI. If they're 1 contiguous building, they're counted as 1 building. Tents don't count as permanent. I don't know enough about igloos to know how permanent they are, but let's say they don't count. Seldom inhabited radio stations count.

My own research has pointed towards the lighthouse on a remote island off the coast of Cornwall to be a likely contender, since it's 70 kilometers away from the nearest building.

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IMPORTANT NOTE: From comments we have a photographic proof that in recent years there were two buildings (but in the same platform), so this answer do not fulfil the question requirements (later precised: Arctic research stations count as multiple buildings [which are similar to this]). (Until nature will destroy this station, and maybe a new one-single building will be constructed).

I suspect sometime the most isolated building is a hut/radio station on Bouvet_Island. Note: In theory, they also have an internet top domain (.bv).

Looking from Wikipedia and maps, I'm not sure there is only one single building, but it seems so. Note (from Wikipedia), sometime buildings were destroyed, and years later rebuilt. They may be inhabited for few months from time to time. So I assume, when the building is not destroyed by nature, it is the most remote building.

Why do I suggest the hut/radio station on this island? This island is the most remote place on Earth, so there is a good possibility that it also has the most remote buildings (also because I found no references that Bouvet ever had 2 or more huts).

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    I don't know if there are further buildings on the island, but the current research station is itself separated into two buildings. At least I would consider it as two separate buildings, although they are placed on the same plattform: npolar.no/norvegia – Tor-Einar Jarnbjo Jul 14 at 11:33
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    @PatrickMevzek There are no registrations, you can't register a domain with that TLD and there are no plans to open the TLD for registrations, so it has absolutely no practical significance that it "exists". – Tor-Einar Jarnbjo Jul 14 at 23:09
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    @DavidSupportsMonica But why? Any domain at any place in the DNS tree can exist without anything below. You are just creating new definitions. The bv domain (TLD) exists because if you query a root nameserver for it it does not say NXDOMAIN (domain does not exist) but gives back a reply. This is a proof of technical existence. You can instead choose any other definition that suits you, but the technical facts remain that this TLD exists. – Patrick Mevzek Jul 15 at 0:45
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    That's where RoyG hosts his website. – xdhmoore Jul 15 at 2:20
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    So are we saying that if there is one hut on this island it is clearly the most remote building, but as soon as they put up another hut next to it, it immediately loses this title and becomes no more remote than my garden shed? That seems a bit odd... – Oscar Bravo Jul 15 at 8:36
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It may well be the Earhart Lighthouse on Howland Island, smack dab in the middle of the Pacific about 3000 km from Hawaii:

enter image description here (Courtesy Joann94024, Wikipedia)

https://en.wikipedia.org/wiki/Howland_Island

https://maps.app.goo.gl/wHMGRizq7uqzYeaD9

Built in 1937 for Amelia Earhart's attempt to cross the Pacific and promptly abandoned. It's not entirely clear if it was ever really a habitable lighthouse, but it certainly is a "structure for human activities", and on casual inspection I can't find any other structures for hundreds of miles around. (Baker Island is not far away, but it appears to contain nothing at all.)

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