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

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

A beautiful but toxic fountain of mercury.

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

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

This house's itty bitty size means no humans allowed.

Statue of a decomposing prince that once held his heart in its hand.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

A gorgeous gilded tower houses what may be the world's largest collection of gin.

The world's most active stratovolcano is almost always erupting.

A hidden three-foot-wide house separates these two regal churches.

The stunning interior of this Gothic church is covered in ornate gold details.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

Explore the quarry where the marble was sourced for Michaelangelo's David.

The world's largest bamboo labyrinth is a living demonstration of the plant’s immense potential.

The final resting place of the famous violinist, after his corpse was denied a proper Catholic burial for decades.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

An incredible menagerie of more than 3 million taxidermied animals at the oldest science museum in Europe.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

The oldest operating pharmacy in the world features 800-year-old recipes.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

The middle finger of modernity.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

A celebration of all things tacky, garish, and bizarrely creative in the Romanian capital.