Mexico’s Giant Crystal Cave Is Beautiful But Deadly ... CaSO₄·2H₂O.), some of the largest natural crystals ever found. The largest is 11.40 meters (37.4 ft), with a volume of about 5 ...

A sort of south-of-the-border Fortress of Solitude, Mexico's Cueva de los Cristales (Cave of Crystals) contains some of the world's largest known ... walls studded with crystal "daggers," the ...

An abandoned mine in Spain hides a sparkling treasure – the world's largest geode, a natural crystal ... Mexico, which has larger spars (15m long compared to Pulpí's two metres), but which is a ...

Visitors seeking unique and quirky attractions should explore America's largest man-made crystal cave, located in the city's Memorial Park Cemetery. The Crystal Shrine Grotto, a 60-foot deep art ...