Hundreds of personalized inscribed planks make up this historic boardwalk.

A coastal rock outcrop with mysterious inscriptions variously attributed to Native Americans, Portuguese, Phoenicians, Norse, and more.

The final resting place of New England's last "vampire."

A stone marker dedicated to the “Father of American Education.”

These structures were inspired by both Native American shelters as well as, strangely, an ice cream shop.

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

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

A surreal, Gaudi-inspired play space near an Anaheim community center.

A small sculpture garden that provides a microcosmic representation of California.

A tribute to the statues of Easter Island along Route 66.

Two geoglyphs that are truly unique to North America.

The stone-covered graves lie within the ruins of an Old West ghost town.

Ancient human, animal, and geometric figures drawn in the earth.

Bringing back the art of handmade custom coffins.

Nevada's largest cactus collection stands outside a candy mogul's small factory.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

The largest dune field in the Mojave offers a chance of hearing the 'singing sands.'

Built as a schoolhouse in 1914, this Mission-style building has also served as a dancehall, a library, an Army canteen, and now a cultural museum.

A 250 million-year-old rock formation has earned a rather unique nickname.

This simple highway curve has become a comedic pilgrimage site.

You don't have to be a diplomat to visit the so-called Camp David of the West.

Nestled in Coachella Valley, this museum transports guests from the Mesozoic Era, to the land of Egyptian kings.

This outdoor observatory offers stellar views and a scale model of our solar system.

These lush groves of fan palms rise up like oases out of southern California's Colorado Desert.