Architectureal fantasy quarter of Rome.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

A subterranean relic of the Spanish Civil War hides below this picturesque park.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

This unique temple complex remains off the typical tourist trail.

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

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

Turntable anonymously received orphans, alms, and groceries.

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.

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.

Mountain where Jesus was first tempted by the Devil.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

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

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

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

A once grand hotel now sits eerily abandoned in the Catalan countryside outside Barcelona.

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

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

One of the greatest maze designer’s greatest mazes.

Cursed swimming pool left abandoned is now a favorite of filmmakers and ghost hunters.

The Gaudí-inspired building that was the start of Terrassenc modernism.