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

There’s a hidden military meme engraved on the World War II Memorial.

The most decorated dog of World War I is preserved in the Smithsonian.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

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

Home to items never before seen by the public.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

This legendary city has been a tourist attraction for centuries.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

The hallucinogenic center of the ancient world.

This famous archeological mystery may be an ancient example of movable type.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This Swedish astronomical clock was in storage for almost a century before its glorious workings were put on display once more.

Swedish skyscraper with a 90° twist.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

Two stone columns flank the grand Venice square, but there were supposed to be three.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

A rather vulgar example of the transition from Latin to the Italian vernacular.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

A Nesting Doll of Churches.