At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

Cold war icon and onetime "hole" in the iron curtain.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Dedicated to the man who saved hundreds of children from Nazi-occupied Czechoslovakia.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

A Swiss amusement park entirely dedicated to the theory of ancient astronauts.

One of the highest mountain passes in Europe has been ranked among the best driving roads in the world.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

According to tradition this is the oldest church in Venice, but its actual age is a mystery.

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

An Italian vineyard invites religious pilgrims to stop by 24/7 to get their drink on, for free.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

The walls and streets of the ancient city are peppered with penises.

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

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

Pompeii's less famous neighbor is still revealing her secrets.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

Pilgrimage site for star-crossed lovers.

Not far from the more famous House of Juliet, visitors will find the supposed residence of her lover.