feet in hiking boots of a male explorer standing on top of a staircase between narrow rocky groove

boots canyon cliff concept day ecosystem eifel environment eroded erosion europe exploration explorer feet forest formation formations geologic geology germany green groove ground high hiker hiking hill irrel landscape male man massif massive mountain narrow nature old park path people plateau ravine reserve rock rocky route rural sandstone staircase stairs stairway standing stone summer sunny teufelsschlucht top tourism trail travel valley wall walls wilderness woods