A hidden alley in urban Baltimore is a haven for graffiti artists.

A museum dedicated to exhibiting remarkable outsider art.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

A pyramid commemorates the birthplace of James Buchanan, the 15th president of the United States

This cabin from the 1850s is one of the first structures built by Chinese immigrants in California.

A statue commemorate Tommie Smith and John Carlos's brave protest at the 1968 Olympics, a watershed moment for civil rights.

Inside this museum, the history of the Walt Disney Family empire is on full display.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

Home to the "Circus" trees created by Axel Erlandson.

The quiet canyon has a tumultuous history involving a doomsday cult.

An overlooked and unassuming engineering marvel.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

Golden Gate Park's historic collection of plants.

With the touch of a button, you can read a randomly selected short story.

This hilltop park offers magnificent views and a Frank Lloyd Wright masterpiece.

The biggest pinball arcade in the world has over 600 pinball machines, and 300 arcade machines.

The abandoned personal amusement park of the King of Pop.

No matter what it might seem like on film, most scenes filmed on a plane are filmed at this LA studio.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

The small first-floor apartment where the author wrote her Pulitzer Prize-winning book 'Gone with the Wind.'