famous cave "cuevas del drach" (dragon cave)

cave formation quail caving stalagmite stalactite geology tunnel wadi person ice canyon darkness trunk rock infrastructure night mallorca dragon caves mountain majorka national surface background cala beach landscape cuevas drach mineral speleology attraction palma underground sea porto tourist vacation baleares stone water island nature europe spain majorca travel balearic grotto blue mediterranean touristic rainwater aged old historic spanish subterranean rocky holiday famous del