This Ottoman-era church is hidden amid a busy tourist area.

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

Underneath one of the region's most historic roads lies the home of Plato's successor.

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

This century-old, family-run bakery specializes in loukoumades, a Greek doughnut once served to ancient Olympians.

A Byzantine church containing the holy remnants of three saints sits atop the site of an ancient temple.

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

A crushed gate and giant bronze head serve as a reminder of Greece's fight for freedom.

A Byzantine-era church hidden in a wooded area below the Acropolis.

With no menu and no sign, this 130-year-old taverna doles out affordable home cooking.

Large collection from the 3rd millennium BCE.

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

Legend says this sacred tree was a gift from goddess Athena.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

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

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.

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

Dunk your churros in rich hot chocolate on the city’s old “Chocolate Street.”

A bookstore dedicated to the intersection of comedy and art.

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

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

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

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