This large copper bolt represents the benchmark for measuring sea levels in most of Europe.

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

A beautifully eclectic mix of architectural styles.

In the depths of Glasgow Cathedral's crypt, one pillar stands out from all others.

Hidden on a cobblestone street in Glasgow, a Czech Cajovna-inspired teahouse serves as a hangout for Bohemians.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

The final resting place of soldiers' loyal canine companions.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

These fantastically named natural pools look like something out of a Scottish myth.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Remnants of a Victorian garden feature sitting in public woodland.

A portly statue of a golden boy commemorates an unusual cause of the Great Fire of London: the sin of gluttony.

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

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

The single richest source of elemental discoveries in the world.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

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.

Ancient burial grounds of the wealthy.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

A six-ton wedding present for the King of the Scots.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.