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It is one of the most popular daytrips out of Sydney, particularly in the hot, sweltering summer. And it's only an hour or so away. It is the Blue Mountains -- with its spectacular rock formations, cliffs and ravines, and a wilderness you can get hopelessly lost in. From the Sydney central business district, provided you can get to the M4 freeway right away, you could be in the Blue Mountains foothills, just after Penrith, in less than an hour.