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

An important example of architectural history slowly decays in the city center.

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

After a catastrophic forest fire, a Greek artist transformed scorched tree trunks outside an old sanatorium into this haunting sculpture garden.

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

Where commuters walk through remnants of an ancient Greek necropolis.

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

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

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

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

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

Catacombs turned marketplace.

Eighty million natural history specimens call this gargantuan museum home.

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

A sharp sculpture made of thousands of pieces of jagged glass.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

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