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

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

One of the most photographed locations in the entire city.

An artistic melting pot inside an old roadside inn from the Ottoman era.

An abandoned Byzantine fortress and notorious prison.

A brutalist gem towering over the heart of Milan.

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

The secret medieval communication system will whisk your words above the noise of the crowd.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Breathtaking and huge 430 year old maps of Italy.

This is the oldest Roman-made bridge in the city still existing in its original state.

This church houses the tomb—but not the remains—of St. Nicholas, the likely progenitor to Santa Claus.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

One of the best-preserved medieval streets in Europe.

Scores of wax baby figurines add an unusual mood to this beautiful church on the Greek coast.

This secret coastal village is studded with pastel-colored houses all piled on top of one another.

Learn about the sweet, storied legacy of beekeeping in ancient Greece.

A dark, narrow tunnel that leads to a charming lake and waterfall.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

Every spring, locals see the shadowy figures of a ghost army of slain Greek soldiers descend upon this ruined fort.

This famous archeological mystery may be an ancient example of movable type.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.

This little Greek plateau is home to thousands of rustic, white-sailed windmills.