In 1909, the steepest and most difficult piece of track on the Canadian Pacific Railway was replaced with a series of spiralling tunnels cut into the mountains.

Few other hotels can rival the grandeur of the Castle in the Rockies.

Though many were skeptical at first, these animal-specific routes across the Trans-Canada Highway have been a major conservation success.

Decorated by local artists, the city's utility boxes have become three-dimensional canvases.

A controversial blue hoop has been puzzling freeway drivers since 2013.

This First Nations monument is a peaceful spot with vast views of the Calgary prairie.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

This well-traveled chess park offers scenic views of the pacific and a colorful, eclectic clientele.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

A second generation sun-powered marvel lights up the night.

The blinking light atop the iconic landmark has been sending secret messages for decades.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Marta Becket's hand-painted theater in the desert.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

These markers are used to determine the ground stability of the Strip.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

These markers are used to document elevation changes around the famed dam.

Experience a charming 1930s version of "infotainment."

One of the oldest train stations still standing in Virginia played a vital role during the Civil War.

Before founding the American Red Cross, Clara Barton had a tremendous humanitarian impact by locating thousands of missing soldiers.