An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

The largest Buddha statue in the Western Hemisphere is just 50 miles north of NYC.

The remains of what was once the world's steepest passenger funicular.

This abandoned cemetery is crumbling into ruin, exposing the artifacts and bodies buried there.

The largest known open fault in the United States is basically a giant natural refrigerator.

This natural rock "church" might not be a proper chapel but that doesn't mean it's not beautiful.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

This stone gatehouse was once the entrance to a historic mountain resort, and it had a cameo in a cheesy cult horror movie.

A once grand hotel is being retaken by the wilderness it once capitalized on.

An abandoned dollhouse factory.

For over 80 years, Mayan ruins stood proudly in a most unlikely location.

Japanese gardens dedicated to the Japanese farmer that refused to throw in the trowel.

Native Americans built this circle of stones, which was used to predict astronomical events.

A rapidly disappearing glacier filled with extinct grasshoppers, perfectly preserved in the ice.

The highest point in Montana is as rugged and singular as the state itself.

This off-the-beaten-path abandoned town is a relic of Montana's silver mining boom.

Touch an actual dinosaur bone at this eclectic trove of Rocky Mountain treasures.

After Havre burned down, the best place to build was under the ashes.

This beautiful ancient site is dotted with perforated sandstone pillars considered sacred by some Native American groups.