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Incredible places hidden right under your feet

Architects in modern times design buildings that reach for the stars. However, back in ancient times people were constructing downwards, creating entire cities under the surface. Sometimes such places get buried after being abandoned and Mother Nature has taken over, only to be discovered centuries later. There are cities hidden right beneath your feet that are basically complex tunnels or cave systems which people have transformed over the years into livable dwellings. (This story originally appeared on The Active Times.)

The Active Times Staff
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