Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

This impressive tunnel was dug entirely by hand over the course of 36 years.

The liveliest ghost town in the state.

This unique graffiti art from the 1940s has become a staple of this local landscape in the remote California desert.

One of the most unusual geological features, recognizable from a dozen hit movies.

When oil was discovered just outside of Pittsburgh, the city became home to this regional stock market.

The legacy of baseball great Roberto Clemente is preserved in a retired Pittsburgh fire station.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

The legendary building that needed ghostly approval before being built.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

Dozens of lights dangle from the branches of what may be the brightest tree in Los Angeles.

Once the central jail for Los Angeles, this building housed inmates like Al Capone, those arrested from the Zoot Suit and Watts Riots, and individuals imprisoned for their sexuality.

The neighborhood of Eagle Rock is named after a gigantic boulder with a shadowy surprise.

A historic fort commemorating the United States' naval history.

A classic American barn that was the home of a classic American television star.

Raised illegally, Reggie now lives at the Los Angeles Zoo after authorities spent years tracking him down.

An iconic location along the Los Angeles River where countless movie scenes are filmed.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

A Cold War site complete with rusty structures, hiking trails, and beautiful views.

Rare collectibles from automated musical instruments to 250 unique automobiles.

Outposts of this restaurant chain were shaped like jaunty chapeaus.

This rare tortoise skeleton has been hanging around the downtown Los Angeles museum for over a century.