This luxury hotel suite is located deep in the bowels of an old mine.

According to legend, this boat-shaped henge is built over the grave of a mythic king.

Early habitat dioramas and home of the elusive gaff, the skvader.

Largest island in the Baltic Sea experiences such idyllic weather that roses bloom in the middle of December.

This chimerical bridge/tunnel appears to dead end right into the sea.

Stockholm's deepest subway station is also a stunning ecological wonder.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

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

It houses the remains of a 17th-century version of the Titanic.

A church of bones, decorated with 40,000 human skeletons.

An underground city of salt.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Eighty million natural history specimens call this gargantuan museum home.

One part local history, 99 parts gruesome haunted house.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.