This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

An abandoned 1920s school with a mysterious history.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

Take a stroll through this centuries-old tunnel of enormous moss-hung evergreens, nestled among the grounds of America’s first public sculpture garden.

The uniquely-designed winter home and sculpture studio of Anna and Archer Huntington.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

In a time before lifeguards, this house was a sanctuary for the shipwrecked.

A unique set of caves that spits waves back out into the ocean.

Hawai'i's oldest wooden house was shipped around Cape Horn from Boston in 1820.

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.

During the solar phenomenon "Lahaina Noon" this bendy, curvy sculpture forms a perfectly circular shadow on the ground.

Hiding in plane sight.

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.

Don't pass Gas, stop and enjoy it.

This unusual sculpture honors the city's namesake, Octave Chanute, for his pioneering work in early aviation.

A Google software engineer's Easter egg led to what may be the world's most unusual saved screenshot.

This historical marker is all that remains of Octagon City, Kansas, a failed vegetarian utopia.

It's hip to be square in Iola, home of the largest town square in the United States.

Before he was the "Big Train," baseball's greatest pitcher was the original "Humboldt Thunderbolt."

Twelve unique carved plaques across Humboldt tell a story of the ingenuity and bravery of ordinary citizens during the city's burning.

Nature's biggest mammal swims in landlocked Oklahoma.

The longest of the four remaining covered bridges in Missouri.