This expansive bridge in the Canadian wilderness was originally just built for friends.

Mysterious 500-year-old tapestries depict a unicorn hunt.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

This replica of the Greek structure is in the heart of Nashville.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Go inside to really appreciate this 500-year-old technological masterpiece.

World's first "penitentiary," meant to be humane, drove men insane.

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

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Famously misunderstood wonder of the ancient world

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The second-largest (of only two in the world) large particle collider is the underdog of experimental physics.

The former site of an all-but-forgotten colonial landmark is now remembered by an often overlooked bas relief.

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.

A mysterious stone embedded at the base of a historic Boston building.

The massive machine creates cracking displays of indoor lightning.

The site of Paul Revere's historic two lantern warning.

Radical Bookstore and Community Space.

Dim sum, served in a grand old theater.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.