Remote ruins of a 2,400-year-old Iberian settlement.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

A surrealist labyrinth and museum of contemporary sculptures.

A science fiction-inspired apartment building designed by a famous Spanish architect.

An architect transformed this abandoned cement factory into his castle-like workshop.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

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

These 2000 year old remains of a Roman aqueduct are hidden inside a hotel lobby.

This store decorated with Japanese and underground pop culture items has been the centre of Barcelona alternative fashion scenes for more than a decade.

The unexpectedly beloved remnants of a controversial thermal power plant.

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

Catalonia Tradition: Beating the hollow Christmas log until it defecates in your fireplace.

An eclectic collection of thousands of items owned by the sculptor Frederic Marès.

This mansion oasis contains gardens, sculptures, and fountains just off the busy Plaça Kennedy in Sant Gervasi.

One of Europe's largest supercomputers is housed inside of a disused chapel.

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

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

Occupied for six centuries by Franciscan Order nuns, this monastery is an amazing ode to Catalán Gothic architecture.

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

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

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

Mountain where Jesus was first tempted by the Devil.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

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