The seven-level cave system in Bellevue features unique rock formations and an underground river, discovered in 1872 when a ...

Tulelake, CaliforniaFormed by half a million years of volcanic activity, Lava Beds National Monument contains the highest ...

The caverns sit atop the Grand Canyon Inn between Peach Springs and Seligman and are a worldwide tourist attraction.

The discovery of human remains in 1967 provided insight into the centuries of use of Stark Caverns near Eldon by Native ...

A new exhibit at Shenandoah Caverns includes the replica of a skull of a now-extinct pig-like animal discovered inside the ...

Maintenance problems affecting the Strategic Petroleum Reserve are in the spotlight after oil releases under former President ...