The Hagga Basin and its surrounding Rift regions are marked by dramatic terrain shifts and even tougher foes. While you’ll find fewer Sandworms here ...

Inspired, Mijares returned to Callao Cave in 2007 to literally dig deeper. The team excavated more than five feet of clay below where they had stopped digging in 2003, with no fossils in sight.

Mammoth Cave National Park is Kentucky's only national park, but it isn't the state's only cave open to the public.

Explore Goblin Valley State Park like never before as we hike to Goblin's Lair, a breathtaking hidden cave surrounded by Mars ...