Its columns were all carved from the same white oak tree.

An abandoned castle owned and ignored by Masons carries a cursed history.

A pair of 19th-century granite markers symbolically record where the state boundaries of New York, New Jersey, and Pennsylvania intersect.

This stone bridge is all that remains of a submerged New Jersey town.

Original factory of John G. Borden who started what we know today known as Borden Dairy.

Of all the unique artifacts inside this library, a mummified hand stands out among the others.

Dozens of houses in the Adirondack Mountains are reminders of a literal "cottage industry" to cure people of a deadly disease.

The Catskills retreat of naturalist writer John Burroughs.

Beneath its placid surface, one of New York City's primary sources of drinking water hides a haunted past.

One man's swirling six-acre monument of stone.

Herman Melville wrote 'Moby Dick' in this landmark 18th-century house surrounded by farmland.

Standing 191 feet tall and measuring more than 55 feet in circumference, this is the world's tallest spruce tree.

Despite a legend that says this highest peak in Oregon was climbed in high heels, scores of people have died on its slopes.

Boats and fish both find their way through this massive hydroelectric structure.

Home to the only outdoor municipal elevator in the United States.

Home of Howard Hughes' Spruce Goose.

At this airport "microcinema," you can catch a film before you catch a flight.

The wooden airship was the largest flying boat ever built.

This coastal rock formation resembles a churning cauldron at high tide.

On the Oregon coast is a natural hole that seems to be draining the sea.

Only known mainland rookery of the threatened Stellar sea lion.

The park preserves a single, rare species of carnivorous plant that spells doom for unsuspecting insects.

Fifty years after a “blast blasted blubber beyond all believable bounds,” this idyllic natural area commemorates the carnage.

The world's last remaining store of its kind.