This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

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

Mountain where Jesus was first tempted by the Devil.

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

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

A beautiful but toxic fountain of mercury.

Just across from the "Last Supper" painting is the famous painter's vineyard, a gift received for creating the masterpiece.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

Vintage furniture and art share space with all manner of collectibles at this quirky shop in Bangkok.

Amsterdam's Red Light District leaves little to the imagination.

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

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

Sail in for a ’dam good slice.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

Cat art as far as the eye can see.

The world's only museum devoted to the wonders of fluorescence.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

A floating cat sanctuary on an Amsterdam canal.

Perhaps the most spectacular grotto along the Algarve coastline.

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