This 19th century hydroelectric powerhouse was the first of its kind.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

The longest burning light bulb in the world.

The headquarters of a secretive order is also a beautifully-designed park.

An extensive collection of ancient Egyptian artifacts and mummies.

A tree bears footwear on the loneliest road in America.

Giant jewel-toned statues fill the grounds of this Cambodian Buddhist temple in California.

The oldest lighthouse on America's west coast no longer needs keepers, yet they maintain the site anyhow.

Every year, over 25,000 monarchs overwinter in Pacific Grove.

Haunting and beautiful trees, doomed to die.

This remarkably simple jail went over a century without an escape.

The oldest U.S. Government building in California, and it's State Historic Landmark #1.

Home to the "Circus" trees created by Axel Erlandson.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

Where the writer penned his famous story about a jumping frog.

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

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

This historic tower in the California desert promises visitors a "vortex of good vibes".

Erroneously called the world's tallest flagpole, this landmark is devoted to "good neighborliness."

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

A hand-built folk art installation covered with messages of God's love.

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

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

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.