A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

Wandering this ancient burial place offers a glimpse of the afterlife in the fresco-adorned tombs of an ancient Etruscan civilization.

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

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

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

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

This abandoned Greek island was the last active leper colony in Europe.

Monasteries on rock pillars, once accessible only by frayed ropes.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

These ancient ruins hide in plain sight next to a dessert shop.

The hallucinogenic center of the ancient world.

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

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

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.

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

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

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

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

A closer look at this somewhat faded hotel by the Corinth Canal reveals the architectural undertones of a genius.

This legendary city has been a tourist attraction for centuries.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

Before there were doorbells this bronze ear was installed for visitors to announce their arrival.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.