This canyon is named for a unique geologic formation where the river vanishes underground near the mouth of the canyon and reappears farther down.

A renovated hotel is bringing new life to a nearly-abandoned mining town in Colorado.

A cave's rare beauty held a cavernous secret hidden underground.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

This unassuming layer of clay boasts an out-of-this-world origin story.

The park preserves a single, rare species of carnivorous plant that spells doom for unsuspecting insects.

Post office plaque commemorates local resistance to a cult invasion.

The largest source of fossilized insects anywhere.

The narrow mountain road that carves a path between Florence and Victor is tied to ghost towns and ghost stories.

This 80-year old mannequin is so lifelike it is believed to be an embalmed corpse.

This naturally-sourced hot spring is now home to a clothing-optional resort.

A few dilapidated structures are all that remain of this deserted former silver mining town.

The site of the "Bone Wars" between two rival paleontologists during the dinosaur rush of the 19th century.

Now a secluded county park, this site was once a "health tourism" destination for wealthy Oregonians.

These century-old beehive-shaped kilns were built to produce charcoal for nearby mines.

Formerly secret, precariously perched boulders.

Inside this small museum resides a strange mix of miniature collections passed down over time.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

The highest point in Texas is capped by a big silver pyramid.

All that remains of this abandoned coal town is a beautiful, haunting cemetery.

The trunks of 3,000 year-old trees lurk beneath the surface of this crystal clear lake in Oregon.

Isak Heartstone, a 15-foot wooden troll made out of recycled materials.

A Victorian-style home known as the “Castle on the Hill.”

Rushing water plunges over a 100-foot drop created by an ancient lava flow at this majestic waterfall.