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

18th century anatomical amphitheater of the Royal College of Surgery of Barcelona.

An open-air "garden" of mural art that changes weekly.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

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

An early 20th-century bullring converted into a modern shopping center.

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

For one day every month Barcelona's Estació de França transforms into a market for model trains.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

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

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

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

A once-secret library of Freemason history in Catalonia.

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

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

One of only three examples of a stained glass window manufactured by the Tiffany Company in Scotland.

The lasting remains of a bygone era of open-air meat markets.

A rare memorial paying homage to an altruistic woman from the 19th-century.

This cannonball embedded in the side of an Edinburgh house once served a surprisingly pedestrian purpose.

This historic timepiece was a popular meeting place for romantic rendezvous in the 1960s.

This modern work of art was a refreshing addition to one of the oldest theatres in the city.

Edinburgh’s version of the Sistine Chapel is this former church, with an interior covered in paintings done by one woman over the course of nearly a decade.

This monument is dedicated to a young boy who survived a disaster that forced Edinburgh to reevaluate its building codes.

A public art piece that barely gets recognized, but then that might be the point.