Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

It was once nicknamed "the most bombed hotel in Europe."

Belfast's namesake river still winds below the city center, hidden from sight.

Claiming to be the oldest hat store in the world, this historic haberdashery had a hand (and a head) in the creation of the Bowler.

Scattered throughout London are ancient remnants of the city's former bounding wall.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

The oldest inn in England served brew to the crusaders.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

The most loyal of little dogs, or a Victorian era publicity stunt?

Hidden on a cobblestone street in Glasgow, a Czech Cajovna-inspired teahouse serves as a hangout for Bohemians.

The whimsical steel spider lurking in the shadows of this suspension bridge shows that engineers can have a sense of humor.

When ecosystems collide in the arid Southwest.

A hidden barn-sized rendition of Grant Wood's most famous, and most parodied, painting.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

As the Dead Sea continues to deplete, massive sinkholes open along its banks.

A "miracle" that seems to produce more holy fistfights than holy revelations.

An ancient capital city that dates back 3,000 years old and harbors many surprises.