Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

This once-derelict building is now one of the most beautiful bookstores in the world.

The beautiful baroque library of the Hapsburg empire.

Secret refuge and museum of the Duke of Florence.

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

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.

This building features dozens of faces along its facade, although one is a bit chilling.

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

After a nearly successful attempt on Hitler's life, the conspirators met their fate in the courtyard of this Berlin building.

Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.

No one really knows how these old hobby horses got here, but the herd keeps growing.

A New England ghost town features a trail of boulders etched with intriguing life lessons.

Over fifty whirling pools left by the glacial age.

The walkable ruins of an 19th century hotel, destroyed in a horse cremation gone wrong.

This field of half-buried stone crosses was the burial place of a sect of heretical gnostics.

The walls of this medieval church are covered with perfectly preserved frescos, including a pristine example of the Dance of Death.

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

A section of the long chain that blocked enemy ships from entering Constantinople.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

This museum was invented in a novel before being made real by the author.

Step back in time and witness the fall of Constantinople.

The former locus of Boston's high culture has been shuttered and buried for over 70 years.