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Swimming in a under ground cave! Ooh my!

Guide Angel Canul is the last man out of Las Calaveras cave, having made sure every tourist has emerged safely at the entrance some 60 feet above the water. Many people stop for a swim when visiting the nearby pyramid at Coba. ~ Photo by Paul Nicklen

Crystal Cave river exit :: Vatnajokull National Park on the East coast of Iceland

Photographing the Jaw-Dropping 'Crystal Caves' of Iceland

Hike Glacier cave in Iceland Crystal Cave, Glacial Cave : Vatnajokull National Park on the East coast of Iceland

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View Of An Iceberg Above And Below The Surface Of The Water Wall Art, Canvas Prints, Framed Prints, Wall Peels

Known as Waiahuakua, this is the second longest sea cave in the world, stretching 1,155ft. It is known as the Sacred Water Cave and as the Double Door cave – as it has both an entrance and an exit. Kayak tours run through the cave to allow visitors a close-up view of the caverns huge length. A fissure in the roof of the volcanic rock allows water to gush into the amazing cavern.

Waiahuakua Sea Cave, Na Pali Coast, Kauai, Hawaii, USA (photo by Matt Parker)

Gadgetflye.com - Daily Dozen — Photos -- National Geographic Your Shot

to capture the beautiful light shafts filtering into the cave from the afternoon sun, the perfect amount of swell added to the effect of just how spectacular this country is. Another stunning feature on the island of'Eua in the Kingdom of Tonga.

A real cave of giant crystals in Mexico.     Every self respecting geek is thinking about Superman and his Fortress of Solitude right about now. :D

Cave of the Crystals or Giant Crystal Cave (Spanish: Cueva de los Cristales) is a cave connected to the Naica Mine 300 metres ft) below the surface in Naica, Chihuahua, Mexico.

Blue Magic on  Biševo (Croatia). 'Of the numerous  caves around the  remote limestone island  of Biševo, the Blue  Grotto (Modra Špilja) is the  most spectacular. On a clear morning,  the sun’s rays penetrate  through an underwater hole  in this coastal cave, bathing  the interior in a mesmerising  silvery-blue light.  Swimming inside is a surreal  must-have experience –  worth a trip to this far-out  island.' http://www.lonelyplanet.com/croatia

Blue Magic on Biševo (Croatia). 'Of the numerous caves around the remote limestone island of Biševo, the Blue Grotto (Modra Špilja) is the most spectacular. On a clear morning, the sun’s rays penetrate through an underwater hole in this coastal c

Blue Caves Zakynthos Island Greece

Marble Cave, Chile Chico, Chile & The most spectacular caves network in the world and this Marble Cathedral is absolutely magnificent. It& located in Patagonia, Chile on the second largest freshwater lake in South America, General Carrera.

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