A hidden world of exotic succulents and cacti.

A large instrument played by the wind.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

The original place where water met land in the City by the Bay is outlined in brass.

A modern frieze of ancient Grecian mythological figures playing a national pastime.

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

This picturesque cliffside beacon no longer calls to sailors but shines once a year in honor of a famous shipwreck.

A giant granite cross remembers missionary Father Frederic Baraga, and his safe passage across an angry Lake Superior.

A whimsical sensor instrument for Minneapolitans to play on their walks to work.

After the musical legend's death, his memorial was mysteriously graffitied in gold.

Ever wanted to can Spam?

Site of James Cook's historic observations of the 1769 transit of Venus.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

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.

A chain of bells connect the California Missions and honor the legend of the "King’s Highway."

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

“It's the quality” (but probably also the drive-through donut tunnel) that has attracted diners since 1968.

This bizarre hotel on historic Route 66 has been plagued by rumors of paranormal activity.

The most unique castle in all of Southern California, entirely constructed from repurposed materials.

A remote desert lookout offers unparalleled views of the California badlands for those who brave the trek.

A monument to a one-legged kidnapper, horse thief, and charlatan asks visitors to throw rocks in a pile.

Along a California highway is a kind of Jurassic Park made of metal.