gorges du loup or wolfsschlucht on the mullerthal trail near echternach in luxembourg, canyon with sandstone rock formation

gorges loup wolfschlucht mullerthal trail luxembourg echternach hiking forest sandstone rock formation berdorf huel lee hohllay perekop cave erosion geology landscape luxembourgish switzerland rocks canyon swiss tree nature stone moss green wall path outdoors wood natural mountain summer aesbech basalt hole trees woodland travel toursim valley europe autumn ardennes wolfsschlucht near formations