America's only nuclear missile silo open to the public.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

A reproduction of earth's many biomes.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Most-visited and most-photographed slot canyon in the American Southwest.

Rippling sand dunes frozen in the Arizona rock.

Massive rock sculptures formed during the time of the dinosaurs still stand undisturbed.

A toxic lake near a volcanic caldera that is home to flamingos and other life.

The inspiration for the Patagonia Clothing logo, Cerro Fitz Roy turns pink at sunrise.

Once swallowed by flood waters, this village has emerged as an eerie shadow of its former self.

A gateway to a mysterious network of underground tunnels.

A tower devoted to — and modeled after — the Divine Comedy.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

A floating museum that was sunk by a flood and left to rot in the tides.

Away from the crowds of fishing enthusiasts, take a hike deep into the woods and journey into an eerie darkness.

Nestled in Onondaga State Park, over 100 canoes carefully stacked in a replica of the famous standing stones.

A flat slab of stone perched hundreds of feet above the Gasconade River in the northern Ozark mountains.

A sculpture of a giant man escaping from the depths of the Earth.

This wooded grove of beautiful hand-built stone grottos is a hidden gem within a shuttered Franciscan monastery.

This otherworldly church spire reaches up toward the heavens.