Hidden beneath the streets of London is a secret subway that only carried mail.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

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

Where once there was a train station bathroom, there is now this German burger joint.

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

A collection of abandoned typographic signs from Berlin and beyond.

An eerie, derelict amusement park in Berlin.

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

Once a train station along the Great Eastern Railway this vibrant coffee shop and bar is where members of London’s creative class mingle.

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

A kaleidoscopic warehouse-maze of handmade neon signs.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

A Victorian park cemetery, standing on the site of what was once the Great North Wood.

Artists and musicians now rule over this former rail station.

English antique dealers with a taste for the unusual.

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

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

A tongue-in-cheek arcade where the games are based on everyday life.

Abstract dinosaur models in London.

A historic arboretum and non-conformist, non-denominational park cemetery.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

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

The final resting place to 300 Victorian-era pets hides inside the city park.