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The Woomera Test Range in Australia is so big that the entire country of Portugal could fit inside of it. The massive piece of land is used to test bombs and missiles, which is an obvious reason why they wouldn't let people enter the area.
Who would want to take a vacation to a missile test site? It wouldn't be the safest vacation, so it's not a place you would want to visit. We are sure they are testing some secret weapons there as well, so only authorized people are allowed to know.
