This mysterious runestone embedded in a church wall is linked to the medieval cult of Saint Erik.

The official meeting point for the oddly named governing assembly of ancient Sweden.

Legend has it this spring formed at the spot where a medieval Swedish king was killed.

A nightly tradition fills the streets of Flogsta with a collective scream.

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

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

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.

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

Copenhagen's celebrated theme park and gardens.

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

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

A stunning gilt bronze relief denounced by Hitler as "degenerate art"—even though it was dedicated to the Nazi leader.

This proud Teutonic warrior rises out of a German forest heralding a victory and measuring lightning.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The 20-mile causeway that separates the Netherlands from the sea.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

Take a walk in a recreation of ancient Rome.

The history of sea-faring refuse and disaster is on cramped display in this Netherlands folk museum.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

The mirrored section takes the shape of Hebrew characters when viewed from above.

A beautifully eclectic mix of architectural styles.

This towering church is home to a world-famous organ and a treasure trove of medieval art.