These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

The suspected burial mound of legendary Viking Björn Ironside.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

This natural "sea of stones" was once used by the Romans as a quarry.

All that remains of this Massachusetts town, demolished in the name of progress, is a stone marker.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

This sandstone gorge in New York State's Adirondack Mountains is home to waterfalls, flumes, and more.

The remains of the worst military aviation accident in Canada's history.

Even Henry David Thoreau found this glacial pothole irresistible.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

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

Explore the dark underground corridors of this graffiti-covered former military fortification.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

This fairy tale-themed amusement park is now abandoned, and childhood metaphors abound.

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.

The world’s largest underground marble quarry is hiding in Vermont.

This cavernous abandoned marble mine is popular with ice skaters in the winter.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

This picturesque abandoned home is rumored to be a spite house.

A rare tour of a commercial jet assembly plant, held inside one of the largest buildings in the world.

A little piece of the Shire is hidden behind a plant nursery in Port Orchard, Washington.

Bonsai trees that are up to a thousand years old.

This Cold War missile launch site has been abandoned for 40 years.

An exercise in patience and imagination, where Mother Earth turned common stuff into precious hidden treasures.