The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

Right next to departures—how convenient!

20kV overhead line with a garland-like cable.

This unusual small wind turbine in Germany has only a single rotor blade.

Remnants of a cone-shaped Nazi bomb shelter.

An old slaughterhouse now holds the largest collection of pig artifacts.

A cement mixer-turned-kaleidoscope in downtown Norfolk offers different views of the city.

This statue is dedicated to Grace Sherwood, the last person in Virginia to be convicted of being a witch.

One tiny triangular park commemorates the victims of a yellow fever epidemic—many of whom are buried right below the grass.

FDR's Art Deco hospital tower was hopelessly inefficient.

One of New Zealand’s few castles boasts beautiful gardens, grand architecture, and a history filled with family drama.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

A celebrity from the late Cretaceous period.

A traditional U-Bahn station in Berlin gets a string of rather untraditional benches.

A restaurant and observation deck built in a unique broadcasting antenna.

Started as a kitchen garden, now the second largest botanical garden in the world.

A brush maker used his factory to protect blind Jews from the Gestapo.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.