stone bridge at grotte di pradis in friuli, italy

grotte di pradis cave cavern grotto landscape italy bridge stone arch architecture countryside august summer singlespan karst karstic segmental roughhewn nature rural travel tourism gorge footbridge pedestrian creek canyon ravine chasm gully old historic historical heritage landmark traditional geology formation erosion eroded trees woods woodland forest alpine carnia carnic alps mountains friuli venezia giulia prealps italian european union eu outside outdoors outdoor limestone natural south sotto pordenone torrente cosa river rock scenic scene scenery picturesque walking hiking green dappled sunlight