They are considered masterpieces, because the caves are actually man-made hollows in solid rock, from which a complex of architecturally elaborate temples and monasteries has been carved with simple instruments.
The caves are considered the unofficial 8th Wonder of the Ancient World.
mnli hypothesis: The caves are considered the unofficial 8th Wonder of the Ancient World. premise: They are considered masterpieces, because the caves are actually man-made hollows in solid rock, from which a complex of architecturally elaborate temples and monasteries has been carved with simple instruments.