Boyden Cavern is 22 mi. n.e. of Grant Grove, off SR 180 at 74101 E. Kings Canyon Rd. within Sequoia National Forest. Guided 45-minute tours wind through underground chambers filled with a variety of sparkling, crystalline formations. Other tours also are available; phone for details.
The temperature inside is a cool 55 F; a sweater or light jacket is advised.
Guided tours are available. Picnicking is permitted. Time: Allow 1 hour minimum.