Village situated on a narrow volcanic escarpment.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This semi-secret storybook hedge maze is also the oldest garden in the city.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A beautiful but toxic fountain of mercury.

This unassuming Victorian cemetery is the final resting place of author Lewis Carroll.

This bronze statue stands throughout the year and illustrates an urgent message about the environment.

A tiny, heartwarming piece of art hiding in plain sight.

This Manchester laundromat is hiding something.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

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

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

A unique tribute to the millions of animals who served and died for the British military.

An architectural oddity hides in plain sight on this iconic London bridge.

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

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

This overlooked street light once served as a KGB dead letter box.

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

Public access to clean drinking water was an instant hit among the masses.