The Deadliest place on Earth? Surviving The Giant Crystal Cave

You mean because of the dog? Chihuahua is the largest state in Mexico. A bit bigger than the UK. The copper canyon is also here. If you ever visit us, I'll buy you a beer.

Better hurry.

It wasn't until 2001 that miners, searching for lead, eventually penetrated the cave wall and brought it to light. The very act of discovering and witnessing them has triggered their slow decay and now no one knows what their fate will be. Once the mine ceases to operate it could be flooded by polluted mine water and abandoned forever, and that's if ambitious mineral sellers don't get to them first and rip them out to sell around the world – a plight of other smaller crystal caves in the area.

If you can't make it to that one you could try Lechuguilla in New Mexico. Also a crystal cave, formed from acid running through limestone, it was featured in David Attenborough's "Planet Earth" series. The prettiest part is the "chandelier ballroom", massive crystals hanging from the ceiling. Access is highly restricted though, you'd probably have to join a queue and go with an official research team. http://en.wikipedia.org/wiki/Lechuguilla_Cave

"One of many places, on or in but near the Earth's surface, generally accessible to human beings and constituting areas in which human activity is desirable or profitable, which are significantly more deadly (insert desired measure of "deadliness" and desired deviation from mean) to exposed/unprotected human beings, over short or extended periods of time, than the mean deadliness of such locations considered as a whole."

Would that make you happier, little pedant? Or maybe you could've just flagged it and moved the fuck on?