A replica of the home of a famous fictional troll family.

A subterranean house of worship carved right out of the bedrock.

Its collection includes a broad array of social, geographic, graphic design, and political history.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

One part local history, 99 parts gruesome haunted house.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The world's first combination ski slope and power plant.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

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

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

A tiny town hall—in Sweden's one-time capital—might be the smallest in Europe.

A Swedish phone box converted into an informal village library.

The oldest Swedish built lighthouse still guides ships through the archipelago.

The city that saw the birth of Sweden is now home to an impressive collection of work from its favorite artist.

The final resting place of the father of modern biological taxonomy.

Few would expect the world's oldest preserved oil refinery to be found in Sweden.

Unfortunately, you can no longer spend a night in this single-person treetop hotel.

Not quite the cultural gateway between China and Sweden its designer imagined.