Cave of the Crystals or Giant Crystal Cave 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. - Credit: http://en.wikipedia.org/wiki/Cave_of_the_Crystals
The Lost Cathedral at Satevo in Batopilas Canyon, near Chihuahua, Mexico. A couple of centuries ago, all records of this church were lost in a fire, and apparently even the Catholic church forgot about it. The people of Satevo have kept it up and it was recently updated, painted and repaired. It sits like a little jewel above the river.