The Most Beautiful Caves in the World - Zlot Caves, Serbia
Arquitectura de la naturaleza (Natural architecture)
Petra, Jordan. Light rays in the caves.
"Oh the Places You'll Go!" - Dr. Seuss.
Lost by ~Deere on deviantART
Waitomo Caves, New Zealand
Crystal cave, Iceland
Passport to Paradise
Macry Cave - Greece
Cave of the Ghost - Venezuela.
Krubera Cave (deepest cave in the world) in the Western Caucasus. OMG I so have to do this on my next vacation..
Hay un hombre entre la hiedra... Isola, Capri, Italy
Water from Donut Falls seeps through a hole in the cave ceiling. The water freezes through the night and thaws through the day during winter.