hanging bridge over gravina canyon in murgia national park, matera, italy

adventure adventurous attraction bridge canyon cave church crossing destination discover excursion exploration explore formation geological geology gorge gravina grey grotto hanging heritage hike hiking italy journey karst landmark landscape limestone lunar matera murgia national natural nature panorama panoramic park peak plateau prehistory ravine river rock rope ruprestrian sassi scene scenery scenic sightseeing stone suspended suspension swaying tour tourism tourist travel trek trekking trip unesco vacation