A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

The pretty iron lamp is a reminder of the architecture underneath London's streets.

This London marker celebrates the spot where the world-famous English band was founded.

The bronze uniforms commemorate the vital role of women during World War II.

This open-air mosaic gallery honoring an English artist took hundreds of volunteers more than seven years to create.

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.

This may be the last of London's wooden pavements, which were once a common sight in the city.

The Great Fire of London and the regulation of one-way streets both started in this alley.

This ancient oak plays host to carvings of magical elves, gnomes, witches, and other creatures prominent in local folklore.

These marks in Myddelton Passage aren't your run-of-the-mill vandalism, and they weren't made by your typical vandal.

Legend has it that seven Anglo-Saxon kings were coronated on this stone, located in the appropriately-named town of Kingston.

Inside this church is an obscure piece of art carved by the famous Alice Liddell.

A replica memorializes the site where women were punished after the last witchcraft trial in Ireland.

These hut foundations are believed to be the residence of Romulus, founder of Rome.

These wooden pipes were crucial to providing water to Medieval Edinburgh.

This small sculpture honors a shuttered bookshop that was the site of a fiery act of protest.

Inside this home, the Icelandic national anthem was born.

A collection of short standing stones covers this hillside.

This museum located in Fondi is also said to be the most haunted building in town.

This former ice house dates to the early 19th-century and featured an underground chamber.

On the edge of the Valles Caldera National Preserve, these rock formations create an eerie landscape.

This unusual sculpture depicts how coins were made when minting was done by hand.

The stone that rocks no more.

This abandoned nuclear cooling tower casts a shadow over a bucolic town.