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

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

A tiny piece of the Moon is embedded in this stained glass masterpiece.

There’s a special club house at the top for the bell ringers.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Once America's tallest structure, now a Baltimore landmark.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

This elaborate towering structure was once famed for its revolutionary height.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

This magnificent museum claims to house the cranium of a disciple and the skull of a pope.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

Nestled on the banks of a river in Nuremberg is a small museum that was once home of the city's official executioner.

It's good luck to be mocked by this monkey.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

Commonly acknowledged as the only public monument to the Devil himself.

Picturesque ruins once held off mighty armies.

Each time a baby is born in Ghent, these streetlights flash in silent celebration.