2. Small church
It takes 20 minutes to get to the cave entrance by van through a winding mine shaft. A screen drops from the van’s ceiling and Michael Jackson videos play, a feature designed to entertain visitors as they descend into darkness and heat.
In many caves and mines the temperature remains constant and cool, but the Naica mine gets hotter with depth because it lies above an intrusion of magma about a mile below the surface. Within the cave itself, the temperature leaps to 112 degrees Fahrenheit.
With 90 to 100 percent humidity hot enough that each visit carries the risk of heatstroke. By the time we reach the entrance, everyone glistens with sweat.
