Stony stairway from the 13th century.  “Elbsandsteingebirge” mountains in Sachsen, Germany

Stony stairway from the 13th century. “Elbsandsteingebirge” mountains in Sachsen, Germany

The Underground River @ Palawan Philippines HDR By: Pipoyjohn by Pipoyjohn, via Flickr

The Underground River @ Palawan Philippines HDR By: Pipoyjohn by Pipoyjohn, via Flickr

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