These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A hamlet full of permanent Christmas spirit holds one of the earliest theme parks in the United States.

The tiny church offers succor to travelers driving by, but only eight at a time.

A logging-themed roadside restaurant surrounded by museum-quality machinery and artifacts from the industry's heyday.

The only Native American museum along the Oregon Trail, run by the peoples who have lived on the land for generations.

Perhaps the only prehistoric monument with its very own public bus stop.

Perhaps the most scandalous statue of America's first president.

The forgotten tomb of the Peruvian rubber baron who was the inspiration for Werner Herzog's epic film "Fitzcarraldo."

Inside a humble hangar is some of the best roller derby the world has to offer.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

Ancient human remains unearthed around the iconic monument.

No two pieces are exactly the same at Portland's hippo-themed hardware store.

The last four extravagant street signs of London's historic banking street.

The seamy, underground secrets of Portland's criminal past.

FDR's Art Deco hospital tower was hopelessly inefficient.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

Local legend says the remains of Father Christmas lie within the medieval grounds.

Abraham Lincoln's vice president took his last breath here on July 4, 1891.

A remarkably well preserved tower dating all the way back to the Iron Age.

Commonly referred to as the most photographed Victorian home in the United States.