2300-year-old Roman road connecting the empire.

Jesus' footprints and the first catacombs in the world.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Mountain where Jesus was first tempted by the Devil.

A second generation sun-powered marvel lights up the night.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

Secret refuge and museum of the Duke of Florence.

Only hotel where you can legally launder money.

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

The prototype for all Nazi concentration camps.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

Electrical pylon in the shape of Disney's beloved mouse.

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

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

London's smallest police station is barely the size of a phone booth.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

Medieval torture techniques with a modern conscience.

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

A little sculpture with a large wardrobe.

A dead saint, a deadly poison, and a mysterious holy ooze.

This one has sailed five times as far as Sir Francis Drake's famous ship.

A dismembered holy head stares out from her beautiful reliquary at the St. Dominic Basilica.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The history and future of cannabis.