This 19th century train workshop is a treasure trove of railroad history.

This 15-story mural celebrates the 50th anniversary of the musician's iconic "At Folsom Prison" album.

The last of a gourmet supermarket chain, this store helped spark California's Food Revolution.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

Singing sand that stands as the final remains of an ancient lake.

A tree bears footwear on the loneliest road in America.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

This railroad magnate's 19th century tower is more than a little bit out of place in the Nevada desert.

These huge stone ovens in the desert fueled the Nevada silver boom, and may have also been a hideout for outlaws.

The longest living non-clonal organisms on Earth.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

This little gem of Spanish Colonial architecture has been abandoned since the 1950s.

A popular winter vacation destination for migrating monarch butterflies.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

The beauty and the beast of hydraulic mining is on full display at this California Historic State Park.

This fully intact Neoclassical-Greek Revival style firehouse operated until 1938.

California's oldest existing theater building hosted an impressive cast of celebrities, including hosting Mark Twain's first lecture.

A watering hole where the options for seating include a bar, patio, or subterranean cave.

A middle school sports field that many believe was the true location of the first successful powered flight - and not by the Wright Brothers.

An abandoned lot littered with concrete debris was once the home of the world's first female railroad president.

A fine mixture of the old and the new topped with an art deco neon spire.

A rich history stashed behind an unassuming door in the heart of Gold Country.