Dinding menjulang ini terletak di kota Groningen, Belanda, dengan ketinggian 37 m (121 ft) dan dikenal dengan nama the Excalibur.
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sumber: http://www.strov.co.cc/2010/10/dinding-panjat-tebing-buatan-paling.html
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sumber: http://www.strov.co.cc/2010/10/dinding-panjat-tebing-buatan-paling.html