A toxic ghost town sitting atop a massive coal fire.

This is one really big nut.

Limestone caves with spectacular showcase chambers.

A century-old cabin off of Highway 30 touts an unusual construction material: dinosaur bones.

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

Derelict buildings are all that remain of a complex at the site of one of the worst mining disasters in Montana history.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

A beautiful waterway tucked in the corner of a power plant.

Located on Guam's south shore, this small cave is named for an ancient and powerful Chamorro Chief.

The underground hideout of a Japanese soldier for whom World War II ended in 1972.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

This simple, broken column marks the final resting place of one of America's most famous explorers.

The resting place of a Civil War celebrity's amputated limb.

This museum dedicated to an oft-overlooked support industry features a surprisingly moving brass diorama of a man being saved from a sinking car.

The beloved, war-tested mascot of a Union regiment graces their battlefield monument.

Home of the only civilian casualty at the Battle of Gettysburg.

Highly spherical boulders on the shores of New Zealand.

This preserved village shows the modest lifestyles of the area's 19th-century Chinese gold miners.

Hundreds of bras, blowing in the wind.

The glacier tucked within a New Zealand rainforest.

A glacier pocked with ice caves and surrounded by rainforests.

This strange geological landscape erupts with sudden bursts of water.

The ruins of New Zealand's largest classical-style church.

Tubing through a cave lit with glowworms is a magical underground experience.