A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

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

Where commuters walk through remnants of an ancient Greek necropolis.

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

This picturesque Umbrian city has a subterranean side that has long remained hidden.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Historic medieval fortified city in southwest France.

Northern Ireland's Brobdingnagian stepping stones.

This bridge was constructed from the rubble of the infamous Bastille.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

The yawning maw of this pagan visage is said to bite off the hands of liars.

100 year tradition of fist fights, marked by marble footsteps.

It should come as no surprise that the world's largest artichoke lies in the town that calls itself the "Artichoke Center of the World."

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.

Not truly a ship nor a building, the Navy's first and last "landship" is now abandoned due to clerical issues.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.