About a quarter of a mile down the south-heading trail from Arnold is another cool spot, Hidden Forest Cave, a partially collapsed lava tube with mature ponderosa pines growing from its floor.

While hiking through dense forest, we stumbled across a hidden opening in the ground – and it led to a cave over 150 feet ... world buried beneath the forest floor. White House dismisses scores ...

Pluto’s Cave is a partially collapsed lava tube in the Klamath National Forest. The cave’s opening ... of an IMAX theater screen — while the floor was covered in jagged boulders.

Crystal Cave has been just more than a tour or a rite of passage. “It’s a portal to something extraordinary,” Stiver said. “A hidden world beneath the forest floor with cool air ...

But the potential for a conflagration in the dry forest is palpable ... including stalagmites on the cave floor and stalactites on the ceiling. “It’s a snapshot,” Katie Wendt, a ...

THE FLOOR IS COVERED IN IT ... which is similar to the ocean, to the forest," said Deb SanSoucie, owner of The Copper Cave. "Those are very negative-ion-rich environments, and they're great ...

Many know Boyd Cave, an easy-to-reach spot with an entrance you can drive right up to. But 3 miles farther down China Hat Road is Arnold Ice Cave (closed Sept. 15-April 30), another fine example ...