America's most famous piece of self-built architecture.

The legendary building that needed ghostly approval before being built.

High on a hill overlooking Los Angeles lives a world famous, high-power conical Tesla Coil.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

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

Hidden above a drug store on a nondescript corner of Lincoln Heights is a private clubhouse for intrepid explorers.

The unique design of these skyscrapers in a Paris suburb led to them being nicknamed "cloud towers."

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

A giant desert bird that once swung music fans at Coachella now has a home in a nearby traffic circle.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

This 1920s Dutch barge is now a floating bookstore.

Anza led the first Spanish settlers from Mexico to Monterey, California in the 1770s.

This sculpture encompasses the emotion of rail travel.

A measuring mishap led to these artificial stone ladies losing their stomachs.

Black cat statues guard this temple-like Egyptian revival factory.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A World War II-era submarine is stuck in the mud in New Jersey.

Once considered a marvel of engineering, this 107-mile canal played an integral role in building New York City.

This 150-year-old train station and caboose have been turned into a railroad museum, enjoyed by young and old alike.

In the power of this waterfall, Alexander Hamilton saw the potential for industry.

The only thing better than tubing down New Jersey's scenic Delaware River is doing so while eating a hot dog from a giant floating stand.