Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

Hidden on the seventh floor of a historic building, this Cajun spot features wall-to-wall bottles of hot sauce.

This is the oldest Roman-made bridge in the city still existing in its original state.

The Pope’s secret escape route.

The "Great Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

This statue is the only female representation of Rome's "talking statues."

A massive marble foot is tucked away in a small alley near the Pantheon.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

This ancient market is often referred to as the oldest shopping mall in the world.

Triangular House built on a leafy residential street in St. Paul.

After the musical legend's death, his memorial was mysteriously graffitied in gold.

This century-old barn is home to a homey, eclectic film festival.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

Named after a lodging site that existed nearby, a bridge has existed at this location since 1455.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Breathtaking and huge 430 year old maps of Italy.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This clifftop arch is a natural stunner.