A Japanese video game arcade hides in the back of a Swedish pool hall.

No one knows who's responsible for decorating this tunnel with stuffed animals, but the people love it enough to protest their removal.

This grisly exhibit houses skeletons and weapons from a devastating 14th-century clash.

Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

Sweden's "good old days" painstakingly re-created in a model village.

The world's largest model of our planetary system.

This legendary dessert was served to Nobel laureates for decades.

Maybe the only restaurant in the world where your seat will be signed by a Nobel laureate.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

Located in an old church, this brewery produces a different kind of holy water.

The library's graceful rotunda is like a bibliophile's temple.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

Some 4,000 individual tiles make up this striking blue billboard from the golden age of air travel.

For more than two centuries, the canopy of this venerable tree has been a haven for songbirds and lovers.

A museum dedicated to one of Portugal's most celebrated writers.

Little-known artist couple chose a former silk factory as the location for a museum dedicated to their work and other avant-garde art.

Entire apothecaries are on display at this Lisbon museum, which explores the history of medicine.

This tile-work piece featuring a chicken riding in carriage is both a remarkable artistic creation and a social commentary of politics and culture in 17th-century Portugal.

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

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

Yugoslavia's biggest underground airport lies in ruins.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

The Great Fire of London and the regulation of one-way streets both started in this alley.