This engineering marvel is the longest bridge in Canada and one of the longest spans in the world.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

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

Pilgrimage site for star-crossed lovers.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

The world's longest known cave system.

A fitting attraction for the corn capital of the world.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The fastest mail service in the west is tracked and memorialized along this 1,400 mile trail.

The house where the famed outlaw was shot by a dirty coward is now a museum to the criminal's legacy.

The only road through the heart of Glacier National Park.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

America's oldest archaeological site or a muddled case of wishful thinking.

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

A motel dedicated to Southwestern nostalgia.

See massive fossils that are over 200 million years old in northeastern Arizona.

Sitting in the arguable birthplace of the Wild West, this museum holds the largest collection of bronco busting bric-a-brac in the world.

Experience a charming 1930's version of "infotainment."

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

The highest point in Washington state is a volcano covered in glaciers.

A wall of chewing gum moonlights as collective art.