Carlsbad Caverns National Park - Panorama of cavern's interior - While a young boy, Jim White explored the cavern with his homemade wire ladder. He named many of the rooms - The town of Carlsbad, which lends its name to the cavern and national park, is in turn named after the Czech town formerly known by the German name Karlsbad (English spelling Carlsbad) and now known by the Czech name Karlovy Vary, both of which mean "Charles' Bath[s]."
The 110-plus caves of Carlsbad Caverns National Park were carved out not by running water and streams like many limestone caves in the world, rather these caves were dissolved by very aggressive sulfuric acid.
Freediving: the magic of exploring the ocean on a single breath
Cenotes have an almost mythical quality – they were sacred to the Mayans who believed they were the gateway to the afterlife and used them for rituals, including human sacrifice. These photographs were taken at cenote called The Pit near Tulum. The light pierces the cool dark waters, providing an ethereal backlight to the caves and caverns below.Photograph: Eusebio Saenz de Santamaria
Daily Detour: Odd spots, strange trips, great moments in travel
Mexico: In the air, above the water, underground ( Christopher Reynolds / Los Angeles Times ) Above ground it's about 100 degrees. Down here in the cavern of Chansinic'che Cenote, near Cuzama in the state of Yucatan, the cool waters of an underground river beckon -- and travelers like this American are liable to take flying leaps. Photo shot in 2012.
"The Pit is an incredible dive site in Tulum Mexico. A fresh water sinkhole with unlimited visibility a hydrogen sulfide layer (aka 'the cloud') and an 'island' of debris (with it's own tree which you can see in the picture)" says photographer Tom St George.