Little is left of this formerly bustling railroad junction on the Transcontinental Railroad.

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

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

A fire lookout atop a glacial pinnacle is reached by climbing three vertiginous flights of stairs.

A unique museum where guests can rent and operate a locomotive.

Shakespeare has been brought to life in this open air theater for the better part of a century.

This now-abandoned part of the original transcontinental railroad route provides a surreal driving and historical experience.

Just off the road outside Baguio, a gigantic lion's head carved into a mountain greets those driving by.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

A picturesque example of brute-force engineering conquering nature.

A showcase of engineering might that was also symbolic of westward expansion.

This Nevada lake holds its titular natural pyramid and, if the legends are true, a number of dangerous spirits.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

Concrete strongholds stand guard over the Golden Gate.

Where a railroad loops under or over itself to rise or drop more than 70 feet in a short distance.

The easternmost town in Alaska can only be accessed from Canada.

This spectacular track has run continuously since 1882.