A New England ghost town features a trail of boulders etched with intriguing life lessons.

A complicated, forgotten beacon of hope for thousands of immigrants, "Canada's Emerald Isle" lies in ruin.

Cliffs that hold fossils, including the earliest known reptile, dating back more than 300 million years.

The Mysterious Witch Bonney, a haunted statue in an old industrial city.

A historic bridge with a lovely acoustic anomaly.

The ruins of one of the first railroads in the U.S. lie hidden within a neighborhood cul-de-sac.

This evocatively named natural crevasse was created by a torrent of water that smashed right through a granite deposit.

The ruins of a Massachusetts prison farm can still be found crumbling the woods of a state park.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

Bizarre Cavern.

Abandoned Coast Artillery fort now serves as graffiti canvas and sightseeing vantage point.

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

Canada's oldest railway tunnel is illuminated in a rainbow of color as it passes under the streets of this small city.

This New England covered bridge is home to the tale of a jilted lover known to haunt the area.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

A toxic ghost town sitting atop a massive coal fire.

This abandoned orphanage-turned-asylum witnessed a terrible chapter in Québec's history.

This 19th century granite fortification is one of the most well preserved forts in New England.

The king of U.S. high points towers over every other peak on the continent.

An abandoned aircraft sits submerged in a lake in the Alaska wilderness.

The highest point in Maine is a grand gift to the state citizens that also happens to be one end of the Appalachian Trail.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

The massive machine creates cracking displays of indoor lightning.