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

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

This strange portrait of six ladies with chicken bodies commemorates a count's dirty habits.

This encrypted monolith protected a secret of Norse mythology by hiding in a church wall for over a millennium.

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

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

Stockholm's narrowest alley is barely over two feet wide.

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

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

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

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

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

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

The most visited, and possibly most controversial, museum in Germany.

This pedestrian walkway cuts through a cemetery and over several burial vaults.

The castle still holds traces of the abandoned Roman fort it was built atop.

Recently restored menagerie of Victorian-era beasts.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

The Tudor-style cottage in the middle of the square is not quite what it seems.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

Scattered throughout London are ancient remnants of the city's former bounding wall.