On Waikīkī Beach, a monument to four extraordinary individuals of dual male and female spirits who brought the healing arts from Tahiti to Hawai'i.

This saltwater swimming pool, which is the last of its kind in the United States, is slowly crumbling within sight of multiple high-end beachside hotels.

A stretch of highway even lonelier than the so-called "Loneliest Road in America."

A mine in the Sierra Nevada that produced nothing but barren quartz.

Despite being a perfectly pleasant place to be, Loyalton can't seem to attract any visitors.

This lighthouse has been guiding shipping into the Golden Gate since before the American Civil War.

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

A 300-ship graveyard, with a few still visible at low tide.

A modest reminder of treacherous waters at the Golden Gate.

US-50 in Nevada is known as "the Loneliest Road in America," but this earlier iteration of the route is even lonelier.

The current Eureka County Courthouse replaced an all-wooden structure that had previously been an ice-skating rink.

Rich red almandine gemstones are waiting inside the volcanic rock strewn across this eastern Nevada hillside.

This abandoned, windowless concrete block is one of the strangest buildings in Tulsa.

The collection is housed in an exquisite mansion that makes you feel like you've been transported to an Italian villa.

The original span of a high bridge across the deep Crooked River Gorge has been preserved for pedestrian use.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

The second-largest giant sequoia in the world.

A hidden gem, named after a San Franciscan icon, offers spectacular views of the Pacific Ocean.

This historic estate on the east shore of Lake Tahoe was home to an eccentric millionaire (and his pet elephant, Mingo).

Eastern zen meets Western grit in these four little trees growing out of a rock on Lake Tahoe’s Nevada shore.

The museum is housed inside the historic 1863 Carson City Mint.

More than 7,000 gallons of water pour over these cascading red quartzite waterfalls every second.

There's nothing creepier than a cemetery next to a clown motel.

This massive solar generating facility in the Nevada desert has been plagued by difficulties.