A local dive where religious kitsch, Southern identity, and queer culture collide.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

An ancient Greek monument and a Byzantine church coexist inside this cave.

This abandoned shopping arcade has new life as an art installation.

Gladiators once walked this ancient, subterranean passage.

An often overlooked ancient site in downtown Athens with substantial history (and nature).

A man's head is enshrined beneath a statue near the first building constructed for the modern Olympic Games.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

An ancient octagonal weather station named for the eight Greek gods of wind.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

On the wall of this medieval square, a symbol of the Spanish Inquisition.

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

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

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

A once-secret library of Freemason history in Catalonia.

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

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

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

A beautiful but toxic fountain of mercury.