The medieval woodcut-style artwork chronicles life in medieval London.

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

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

The broken skateboards that became a poignant memorial to a murdered skater.

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

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

Scattered throughout London are ancient remnants of the city's former bounding wall.

Ship-sized kinetic sculptural fantasy.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

This hidden green space is the city's second largest conservatory.

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

A tribute to all the green-thumbed workers who tend London’s public parks and gardens.

The London statue that imitates passersby.

Murals of the wild parties once held on the frozen River Thames.

This unique exhibit "Dialogue in the Dark" reverses roles as the visionless become guides and the sighted become ‘blind.’

Carved fountains poignantly placed in parks and in front of special monuments.

Crop circles inspired this whimsical garden in Germany.

A German apartment building hosting as many trees as human occupants.

A tribute to the man who lit himself on fire and ushered in the Tunisian Revolution.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

This museum in the famously blue neighborhood of Sidi Bou Saïd showcases a traditional Tunisian lifestyle.

An ancient Phoenician citadel once stood at the site where Queen Dido first landed, according to legend.

Along the most northwestern point in Africa is an ancient cave surrounded by legends.

An abandoned nightclub has become a vibrant work of art.