Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

Two volcanic lakes in an enormous crater formed in a prehistoric eruption.

This modern monument to pagan belief looks like it was transported straight from ancient times.

This stunning concert hall has become a symbol of Iceland's national recovery.

The Arctic Circle runs through this isolated spot north of Iceland.

A Jenga-style cylindrical tower of books that appears to go on forever.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

A lonely beacon, precariously perched atop a remote sliver of rock.

Every year, the colorful murals of Montreal get a complete makeover.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

Small ship votives hang from the vaulted ceiling of this port-side church with a Latin inscription on the wall.

A Montreal deli that was so beloved that it was allowed to circumvent their laws of language.

One of Canada's oldest museums, the beautiful Redpath has been serving up Natural History and Ethnography since 1882.

This tiny abode has been covered in the art of the little old lady who made her life and living there.

The smallest museum in Basel, Switzerland, is a two-foot-by-two-foot window in the door of a 600-year-old house.

Along the Rhine, about a mile from the historic Munster, learn the heartrending story of two lovers torn asunder, cast into unknown layers of time and space.

One of the world's largest collections of pharmaceutical artifacts.

Icelandic settlement in Manitoba established in 1875.

This shop specializes in oddities and Victorian-inspired wonders.