A beautiful but toxic fountain of mercury.

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

A temple to modernity, tucked away amid Barcelona's more well known museums.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

A beautiful little museum hidden away in the heart of Barcelona holds a treasure trove of Ancient Egyptian artifacts

An open-air "garden" of mural art that changes weekly.

Barcelona's only remaining tram system takes riders to the Tibidabo funicular.

An eerie collection of the surviving structures from a past celebration of the future.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

A giant wooden soda bottle pays homage to a distinctly British drink on the very spot where it was invented.

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

This dreamy street will transport you to wintertime in Victorian England.

Hidden on the urban banks of a Manchester river are a series of abandoned waterside industrial sites.

Have a seat with the father of modern computing at this Manchester monument.

This Manchester laundromat is hiding something.

Dating back almost 400 years, the oldest public collection library in the United Kingdom was once the study hall of Karl Marx.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

Since 2017, the remains of Stretford's industrial past have been occupied by a collection of gnomes.

Be on the lookout for the symbolic insect all over the city.

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

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.