The first tunnel to be dug beneath a river, repurposed as an art and museum space.

An artistic tribute to the famous singer, just around the corner from where he was born.

Artists and musicians now rule over this former rail station.

The Columbia Road Flower Market is now open every Sunday, rain or shine.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

A student driver's nightmare.

Banksy gives themself artistic license with this piece of London street art.

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

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

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A hands-off space for graffiti artists to hone and display their skills.

The humble home where the famous beat author lived briefly and wrote one of his most famous works.

Wax models of disease and deformity are on display at this German medical museum.

Twisted buildings adorn the banks of the Rhine river.

Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

This former steel and coal plant is now a neon-lit industrial fantasia.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

An elevator into the Baltic Sea.

This German version of Universal Studios holds a vault of treasures from the NeverEnding Story.

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