An old locomotive hides deep in the forest.

One of the few Civil War monuments to honor a specific enlisted soldier.

A gas station and a state sign commemorating the most famous claims of extraterrestrial abduction.

Abandoned Italianate architecture on the coast of Maine.

Accessible only by boat, this centuries-old island fort never saw troops or combat.

Final resting place for the Triangle Shirtwaist fire’s unidentified victims.

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.

The world-record holder for the longest bridge stretching continuously over water.

An eerie and beautiful group of columns mark the site of a grand mansion lost to time and fire.

The highest point in Louisiana, Driskill Mountain at 535 feet above sea level.

For those going through a life transition, a place to leave behind a piece of your former self.

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

A stealthy Apache hideaway that became the haunting site of a mass grave.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

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

A small canyon with petroglyphs and a seasonal waterfall, only a short hike from the remnants of old Route 66.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

This impressive tunnel was dug entirely by hand over the course of 36 years.

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

The largest drain hole in the world.

A local dialect born in the late 19th century is only spoken in this isolated California valley.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

Each winter this underground cave forms a dazzling ice palace.

The flow from this waterfall sometimes comes out of springs below its rim.