The best place in the world to buy tinned fish.

This charming candle shop has been in business since 1789.

After the owner of this Art Nouveau home died, it was turned into a museum displaying a lifetime dedicated to art.

In the Monastery of São Vicente resides a gallery devoted to a breathtaking collection of seashells.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

Poseidon? No one seems to know.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

Week-long block party becomes a competition for the best decorated street.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

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

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

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

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.

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

18th century anatomical amphitheater of the Royal College of Surgery of Barcelona.

A beautiful but toxic fountain of mercury.

This medieval castle was home to a known tyrant and features several hidden passages.

This overlooked museum houses an amazing collection of rare, antique typewriters.

This zoological museum began as the first great curiosity cabinet.

The remains of an ancient Roman city are hidden underneath Bologna's beautiful public library.

Once known for its horse-powered knife sharpening, this 200-year-old shop offers an array of blades and hard-to-find culinary tools.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.