The Fingal's sea cave in the Hebrides Islands of Scotland is a huge natural formation, discovered in the 17th century and called after an Irish legendary hero. Impossible not to feel like the hero of a tale walking its surroundings.
This is a rare capture of Hang Son Doong Cave in Phong Nha Ke Bang Providence Vietnam. This mystical cave river only appears at the beginning and end of the monsoon seasons which makes the cave impassable. Only two weeks after this shot was taken this river disappeared for the dry season becoming a muddy trench and 200 meters lower.