Jewel Cave is a real beauty. The national monument is one of the world’s longest caves. It’s also one of the most extensive caves. It has a plethora of minerals and calcite spar crystals — none valuable.
The cave was cold (50 degrees Fahrenheit), spacious, dark at times, but truly worth the one hour tour. Now I see why President Theodore Roosevelt declared it a national monument in 1908. Here’s my view of the cave from 200 feet below ground.