The largest flower auction house in the world.

A local train station entrance hall doubles as a sanctuary for barn swallows.

This is Britain's one and only clock concealed in the pavement.

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

A bookstore dedicated to the intersection of comedy and art.

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

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

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

This fountain was designed to honor the man who helped bring water to Barcelona.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

Saint Joseph was said to heal the deaf and blind, but it was a much smaller miracle that got him canonized.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Turntable anonymously received orphans, alms, and groceries.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

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

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

If you visit the burial place of King Frederick the Great, you'll likely find a couple of potatoes sitting on his tombstone.

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

This unusual elevator doesn’t stop or slow down.

Order a salt beef-loaded beigel at any hour of the day or night at this East End institution.

This bronze statue of Martin Luther King was placed in the park without permission.