Cave of Swords

The Cave of Swords

The Cave of Swords (Cueva de Espadas) is the second-largest chamber in the Naica Mine, at 104-metre (341 ft) long, with a volume of 1,400 cubic metres (49,000 ft). It also contains gypsum crystals that are each about a meter long, due to the fact that these crystals are younger and had been growing for much less time by the time they were discovered in 1910.