The magnificent Crystal Cave of Mexico

Well, I just found out about this and thought it's reeeeally awesome. 

"Cave of the Crystals or Giant Crystal Cave (Spanish: Cueva de los Cristales) is a cave connected to the Naica Mine 300 metres (980 ft) below the surface in Naica, Chihuahua, Mexico.

The main chamber contains giant selenite crystals (gypsum, CaSO4·2 H2O), some of the largest natural crystals ever found. The cave's largest crystal found to date is 12 m (39 ft) in length, 4 m (13 ft) in diameter and 55 tons in weight. The cave is extremely hot, with air temperatures reaching up to 58 °C (136 °F) with 90 to 99 percent humidity. The cave is relatively unexplored due to these factors"

https://en.wikipedia.org/wiki/Cave_of_the_Crystals 

It was discovered in 2000, but on February 2017 the mining operation stopped pumping the water out and it was let to re-flood. 

"Naica's crystal caves hold long-dormant life" http://www.bbc.com/news/science-environment-39013829 

Thank God we finally have a good thread!

You're welcome, you can call me Eseles though - but if you insist on calling me God, I have no objection  hahahaha

Greek Gods are the coolest ever!

BEAUTIFUL SO BEAUTIFUl!

I'm glad you liked it

So many wonderful things on our planet! 

But this cave was very hard to find, was discovered just 17 years ago, was very hard to visit, and now it's almost(?) impossible to go inside (cause they let it flood again) 

And there are many things we still don't know about Earth...

http://ngm.nationalgeographic.com/2008/11/crystal-giants/crystals-photography

Photograph by Carsten Peter, Speleoresearch & Films
Gypsum crystals take on an abundance of forms in caves found throughout the Naica mine. The delicate structure here, found in the Cave of Candles, projects only a few inches from the cavern wall, a measure of refinement when compared to its car-size relatives in the nearby Cave of Crystals. According to Paolo Forti, a professor of geomorphology and speleology at the University of Bologna, several minerals have been found here that have never been seen inside caves before, including such tongue twisters as plumbojarosite, szmikite, and szomolnokite. “This system was really stable for a long time,” says Forti. “The caves here are astonishing.”
www.carstenpeter.com

http://www.dailymail.co.uk/sciencetech/article-1081072/Pictured-The-Cave-Crystals-discovered-1-000ft-Mexican-desert.html

The giant obelisks are formed from groundwater saturated in calcium sulphate which filtered through the cave system millions of years ago

Simply gorgeous but not open for the public I'd think.

Also in Mexico nearby Taxco is also a gorgeous cave with enormous length and height. They do concerts inside. Worth a visit, I can recommend. But no such wonderful crystals.

--Many scientists suspect that if life does exist elsewhere in the Solar System, it is most likely to be underground, chemosynthesising like the microbes of Naica.
Dr Boston said her team was about to submit a paper on the caves to a relevant journal.
In her discussion with reporters she lamented the fact that the crystal complex had become flooded following the recent cessation of mining activities, preventing any further access.
"It is tear inducingly beautiful down there. I wrote several poems about it actually."--

http://www.bbc.com/news/science-environment-39013829

[emphasis is mine for @CookedQueen]

Location of the Swords and Crystal caves with the gypsum crystals within the idealized block diagram of Naica mine

The more you know

Wasn't Merlin famously trapped in a Crystal Cave?? Somebody rescue him!!