A piece of the Ludendorff Bridge, also known as Remagan Bridge, calls this military base home.

One of the Treasury Building's original columns now sits as a garden monument in the middle of a busy military base.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

The ruins of an 18th-century mansion that was once named "Mistake" by the man who had it built.

This ducal residence was once home to a future Russian empress and a French king in exile.

The site of the last royal wedding in Korea.

A spectacular Petrine Baroque summer palace commissioned for Catherine I by Peter the Great.

This former Imperial summer home was the venue for a royal slap that once echoed 'round the world.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

This small museum tucked within a subway station holds pieces from Madrid's past.

A rare set of strings by famed instrument maker Antonio Stradivarius is on display in the Royal Palace.

Part of the medieval watchtower is displayed in an otherwise ordinary parking garage.

After the queen of Spain had a dream where these statues fell and crushed her, they were removed from the palace and given new homes around Madrid.

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

Hotel designed by indie graphics artists.

One of Scandinavia's largest mosaics pays tribute to Danish art and science luminaries.

Positioned outside a church, this sinister folkloric figure incited protests in both 1902 and 2002.

Discovered in a peat bog, these horned helms come from a thousand years before the Viking Age.

A former smithy turned cultural hub with the capital's largest mural space.

An unconventional and naturalistic sculpture depicting the artist marking his territory on an exterior faculty wall.

Did he come up with a theory of cosmic-ray showers while sitting in this bath?

The house where a Danish physicist discovered the connection between electricity and magnetism.

Site of the first radio and telephone broadcasting companies in Copenhagen.

The final resting place of one of the brightest physicists of the 20th century.