Far below the Earth’s surface, where the sun rarely penetrates, is a world of twinkling glow worms, precious gems and limestone caves and mountains, a land inhabited by nature alone. Within this world are visions to rival many landscapes decorating our horizon; lakes lie still and calm, great networks of caves know no borders and rivers and rivulets carve an ever-evolving terrain.
The lake pictured here is a sacred spot on the Yucatan Peninsula. See all ten at Environmental Graffiti. Link -via reddit