Some locals believe the fabled lost gold of General Yamashida is hiding somewhere beneath the city.

A series of modernist treehouse hotel rooms grace the outskirts of an Arctic forest.

From a distance, this structure looks like an ordinary office building but a closer inspection reveals a unique facade.

Once the world's most modern observatory, this building is now a private school.

The Swedish flag over this small naval fort signals that the nation is at peace.

An 11th-century runestone decorates the halls of Terminal 2 of this Scandinavian travel hub.

Every Tuesday, students let off steam by screaming into the night air.

This giant subway sculpture celebrates the fruit that inspired the theory of gravity.

A plaque marks the house in Stockholm where the French philosopher René Descartes lived up until his death.

A heated statue pays tribute to one of Sweden's great actresses.

The internet as provided by a James Bond villain.

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

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

A delightful museum entirely dedicated to the tiny homes of dolls.

One of the world's largest collections of medieval religious art.

This biographical museum honors the groundbreaking scientist at her birthplace in Warsaw.

Its frescoes depict the likeness of Marshal Tito, Karl Marx, and Friedrich Engels burning in hell.

This virtually windowless mass of smooth concrete is the only Catholic church in the city.

A naturally beautiful, seemingly bottomless deep blue spring.

Sound travels strangely in this underground whispering gallery.

In the midst of a living monument to Soviet social engineering, Polish Catholics built this church by hand.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

Order “Proletariat’s Cutlet” at this communist-themed restaurant allegedly once visited by Lenin.

When the tide is high, you can see the Atlantic pushing up through a deep, jagged hole in the rock.