You cannot visit the Cave of the Crystals , and no amount of budget planning changes that. The chamber sits roughly 300m down inside a Peñoles lead-zinc-silver mine near Naica, Chihuahua state, Mexico, packed with selenite beams up to 11-12m long, among the largest natural crystals ever recorded. The mine flooded shut in October 2015 when the pumps stopped, and the chamber has sat underwater ever since, off limits to tourists and scientists alike.

Budget travelers always ask the same question first: what does it cost, and is there a cheaper way in? For the Cave of the Crystals the honest answer is that there is no way in at any price. The chamber sits about 300m down in Mexico’s Naica mine, lined with selenite crystals up to 11-12m long and an estimated 12 tonnes each, among the largest natural crystals ever documented. It was never a ticketed attraction, and the mine flooded shut in 2015, locking out tourists and scientists alike.