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Niihau Island, Hawaii, USA

Now, this island has quite an interesting story. The island has been privately owned since 1864, when Elizabeth Sinclair, the famed matriarch of the Sinclair family, purchased it in its entirety. In the 1950s, the island was closed off to the public due to a Polio outbreak. Since then, it's been almost barred off ever since. This is also due to the island residents' desire to maintain and cultivate the island's local culture.

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It is, after all, the only island in the place in the world in which Hawaiin is the official language. A handful of organized tours allow tourists to see some parts of the island, though.