Stalactites and stalagmites in a beautifully lit cave.

Renaissance villa and gardens complete with a tormented colossus.

A 16th-century horror show built in a lovely Italian garden.

An automaton perched above an classic clock and watch store

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

Commonly acknowledged as the only public monument to the Devil himself.

A lush indoor jungle fills this bustling Madrid transportation hub.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

A poignant museum dedicated to the history of the Dutch resistance against Nazi occupation

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.

A unique collection of gilded age mechanical pianos.

The world's oldest Jewish library was founded by Sephardic Jews in 17th century Amsterdam.

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

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Cat art as far as the eye can see.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

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

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

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

This Funeral Hearse Museum represents the finest in cadaver transportation.

A stately palace has been converted into the world's largest cannabis museum.

Mountain where Jesus was first tempted by the Devil.