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

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This large, circular tomb is the final resting place of the first emperor of Rome.

One of seven Jewish catacombs in Rome and one of only two open to the public.

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

A fairy tale castle in modern Rome.

Jesus' footprints and the first catacombs in the world.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The underground sanctuary of a mysterious ancient cult.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Solar observatory doubles as a daring display of Expressionist architecture, much to Einstein's chagrin.

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

During World War II, the Nazis repurposed this beer cellar to store stolen artwork.

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

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

This small train ride offers stellar views of the Grand Garden Palace.