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Ideal for adventurers, Heard Island lies between Madagascar and Antarctica, concealing a breathtaking yet forbidding environment. Only research scientists brave the lengthy journey across treacherous seas to reach this pristine land, which is home to an active volcano named Big Ben. With no ports and rare visitors, it’s a place most people stay clear of, thanks to its harsh and unpredictable conditions.

4. Prochikita Gate, Czech Republic

The Prochikita Gate, a stunning natural rock formation, found fame in movies like "The Chronicles of Narnia." However, because of concerns over erosion and preservation, it has been off-limits to the public since 1982. Though tourists are allowed to glimpse from afar, very few choose to make the trek knowing they cannot enter.