Artists have long been drawn to these atmospheric 12th-century ruins.

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

The red letters in the literary pavement leading to the library form a mysterious code.

19th century tunnels burrowed under Liverpool.

This bronze statue was dedicated to a 1966 Beatles hit.

This aging storage facility is the world's largest brick warehouse.

This sculpture celebrates a boules tournament and the link between Leeds and its twin city Lille.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

A curious cave church carved into the face of a cliff.

According to a local legend, this old castle could only be built after a woman was immured in the walls.

Once a safe haven for locals engaged in blood feuds, this 400-year-old fortified tower is now a museum showing what life was like for those lying in wait within its walls.

The encased skull that is widely believed to belong to St. John the Baptist.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

This 1920s Dutch barge is now a floating bookstore.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

This hospital helped pave the way for treatment that drove down child-mortality rates in 19th and 20th centuries.

You will not be able to miss this building.

This former medical factory gives home to cutting edge arts in the shadow of a gas works.

A local museum honors the overlooked discoveries of Mary Anning, one of the first professional fossil hunters.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

Down a pint of ale where the Bishop of Ely's servants slept in 1546.