white ancient stalagmites closeup in the cages of grotta di frasassi, genga, marche, italy.

cave formation quail caving stalagmite stalactite geology wadi tunnel rock canyon terrain ice person trunk arch cliff white ancient stalagmites closeup cages grotta frasassi genga marche italy europe nature stone cavern vertical landmark famous park excursion guide indoors spooky background natural dark darkness lights travel underground landscape mountain wall light tourism limestone rocks grotto tree water italy