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

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

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

Its collection includes a broad array of social, geographic, graphic design, and political history.

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

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

This mountain trail inspired Nietzsche to complete his magnum opus.

A place to see how French aristocrats lived in the early 1900s.

This massive blockhead sculpture hides an entire library.

35,000 grape hyacinths flow like water down a garden hill.

Furniture tries to escape an abandoned building in San Francisco.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A huge musical instrument played by the ocean.

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

This outdoor gallery of sculptures along the East River was once a landfill.

The oldest pastificio in Queens offers visitors fresh noodles and a peek inside the macaroni-making magic.

This enormous banquet-themed artwork honors over 1,000 notable women throughout history.

A quiet and contemplative oasis in the middle of New York's bustle and riot.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.