Bouldering

Bouldering is a form of rock climbing that is performed without the use of ropes or harnesses. While it can be done without any equipment whatsoever, most climbers use climbing shoes to help secure footholds, chalk to keep their hands dry, and bouldering mats to prevent injuries from falls. Unlike free solo climbing, which is also performed withou...
Found on http://en.wikipedia.org/wiki/Bouldering

Bouldering

Paving with cobblestones.
Found on http://www.selectstone.com/architectural-resources/stone-glossary/
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