The decaying adobe remains of an old homestead are just off the beaten path in Joshua Tree National Park.

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

The so-called "Bridge of Thighs" in Palm Springs allows nudists to discreetly cross the road.

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

An off-grid art installation that encourages its visitors to imagine a world without waste.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

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

Version of the French Riviera destroyed by the sea.

The ghostly remains of an accidental sea.

A giant knight, sex education, date shakes, and Jesus coexist happily in this Coachella Valley desert oasis.

Flip your own pancakes in this old sugar mill within a Florida state park.

Deep in the Ocala National Forest, a lonesome 19th-century grave.

A tribute to Ponce de Leon's supposed quest for eternal youth.

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

America's first wax museum opened in 1948.

Only through the lens of a microscope can visitors see the true treasures inside this museum.

St. Augustine's record-setting narrow street was designed to protect against pirates.

This curio museum seems like the type of place you might find a mogwai or a monkey's paw.

The site of Martin Luther King Jr.'s arrest as he attempted to have lunch.

Built around 1723, this is the oldest surviving home in the U.S.'s oldest colonial city.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

These ruins are all that remain of what a Spanish barrack that likely housed a quarry overseer, masons, and stone cutters involved in the construction of the Castillo de San Marco.

One of the oldest, tallest, and most haunted lighthouses in America.

This general store is stocked with memorabilia from the 1930s onward—almost none of it for sale.