This natural marble cave is one of only five national monuments in Oregon.

This old-fashioned roadhouse's quirky neon sign is as famous as its enormous dumplings.

Beyond being incredibly fun, not much can be said about the Hole with certitude.

A brief journey through early 19th-century pioneer life across Linn County.

The unique circular corral belonging to the “Cattle King” of Oregon.

As a show of peace, a Japanese naval pilot gifted his 400-year-old Samurai sword to the Oregon town he bombed.

A volcanic landmark located on an Ice age lake bed.

Not-so-fearsome tiny trolls live under this wooden train trestle in Portland.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

The oldest family-run restaurant in the United States is a living museum of New Orleans dining history.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

This Italian foot path winds through the mountains via 52 individual tunnels.

Ever wanted the laymen's version of your credit card fine print?

Walk into the 19th century without leaving Brooklyn.

An accidentally hidden library containing the ephemeral history of New York.

Walk over a 150 year old manhole.

Relics given to a Manhattan church to avoid seizure by the Italian government.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

Down a stairway in the East Village, you could once read a plaque describing an alternate history of a fictional version of Manhattan.

Tucked in the back of this amazing antique store is an important piece of medical history.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

The origins of midtown Manhattan's anachronistic wooden farmhouse remain a mystery.

The boulder on which Alexander Hamilton laid his head as he died can still be visited on the New Jersey coast.