The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

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

The bones of the Biblical Magi traveled to Constantinople and Milan before landing in their current home inside an elaborate golden reliquary in the Cologne Cathedral.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Hidden under a shopping centre is the genesis of modern Liverpool.

One of the oldest suspension bridges in the world blends in perfectly with a medieval castle.

Scotland's first Masonic lodge may also be the oldest in the world.

This painting of a beloved dog will be on display at the Scottish National Gallery at long as the museum exists.

The oldest floral clock in the world still functions today.

The colorful stairs are made with marble from the world's major quarries.

This charming old building's loose connection with the Scottish Reformer is what saved it from demolition after it split apart.

This unassuming shed was the stage for a monumental event in British history.

Brass bricks outline the locations of Edinburgh's lost, lively market stalls.

A quirky "castle" formerly belonging to a famous British inventor.

An ancient hotspot for spotting schools of fish.

St Pialas Well has a dark history, blurred by the passage of time and immortalised by a nearby pub.

This abandoned lock-up was saved because of its connection to a local football team.

A devastating booze inferno poured through the streets, claiming several victims who drank it.

This supermarket offers shoppers a window into the past alongside their groceries.

Some of the saint's blood and bones are said to reside in Dublin.

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

A guitar mounted on a wall in Temple Bar honors the Irish musician.

This abandoned concrete building was once hailed as an innovative architectural marvel, originally built to store sugar.

Manchester's abandoned train depot lingers in a post-industrial purgatory.