A museum filled with tiny, adorable versions of the mighty Royal Danish Navy.

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

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

This sublime architectural marvel is a rare example of an expressionist church.

A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

The former home of a mad diplomat is said to still be marked in bloody, arcane scrawls.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

Cat art as far as the eye can see.

This was the second largest mercury mine in the world and one of the oldest preserved mine complexes in Europe.

This small Slovenian town has become a magnet for microbreweries.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

At night, this memorial illuminates a ghostly outline of a footbridge that connected two sections of the Warsaw Ghetto.

Catch a scenic view of Warsaw's Old Town from the top of a centuries-old dumping ground.

A somber memorial honors the hundreds of thousands of lives lost at this labor and extermination camp.

Poland's oldest salt mine has nearly everything one needs to live underground forever.

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

The final resting place of more than 200,000 people, this is one of the largest cemeteries in Europe.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Large Hadron Collider and the Birthplace of World Wide Web.