Riesenburg cave, natural karst cave ruin of Frankendolomite, geotope, natural monument, in the back climber at rock face, near Engelhardsberg, district of Markt Wiesenttal, Upper Franconia, Franconian Switzerland, Franconia, Bavaria, Germany, Europe

activities activity bavaria caves cave central europe climbers climber climbing climb deserted dolomite rock dolostone empty europe famous place franconian dolomite franconian switzerland franconia franken fraenkische schweiz geotopes geotope german federal republic germany karst cave ruins karst cave ruin karst caves karst cave leisure markt wiesenttal middle europe mineral nutrients minerals mineral natural landmark natural monuments natural monument natural nobody no one no people oberfranken outdoor shots outdoor shot outdoors outdoor outside out place of interest recreational activities recreational activity recreation rock faces rock face rock layer rock stratums rock stratum rocks rock wall rocky rock sedimentary rocks sedimentary rock sedimentation sediments sediment sights sight southern germany south germany sueddeutschland tourist attractions tourist attraction travel photography travel uninhabited upper franconia wiesenttal wiesent valley