5Skellig Michael, Ireland

Since it was used as a filming location for Star Wars VII: The Force Awakens, the intriguing isle has become even more alluring. It’s a tough climb up roughly-hewn, steep stone steps to see the ruins of the ancient monastery that perch near the top.

With no handrails, sheer drops and rockfalls, the route can be treacherous with some climbers having fallen to their death several years ago. While safety measures have increased, including limiting visitor numbers, it is still a dangerous place to access. Rough weather often prevents boat crossings too.

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