By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

To find the "unicorns of the deep" you've got to go downstairs.

These pretty kitties killed and ate as many as 135 railway workers.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

Small and slightly hidden, the American Writers Museum is preserving the legacy of America's finest authors.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

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 7th 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 "Greatest 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.