The ruins of an ancient fortification wall sit in front of and underneath this boutique hotel.

A tiny Greek Orthodox church from the Ottoman era hides on a busy city street.

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

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

The ruins of this ancient fortification wall sit in the middle of a quiet, residential intersection.

This seaside sanctuary was once one of the most important religious sites for women in ancient Greece.

Only open for two days a year, this church links ancient Greek and modern Christian celebrations.

A seaside castle complex that stood through centuries of conquests.

According to legend, this cavern holds the passage that Persephone used to travel to and from the underworld.

After being destroyed by two separate fires, this monastery is now home to a small zoo and relics from dozens of saints.

The heads and relics of 179 monks slaughtered by pirates are on display within this Ceonobic Monastery.

The highway's southernmost spot is a beloved local attraction.

The bronze uniforms commemorate the vital role of women during World War II.

This sixth-century church housed an icon with eyes so beautiful legend has it they inspired the name of a Greek city.

A staircase made of gravestones leads up to this church built into a giant rock.

The Greek War of Independence was declared at this medieval Byzantine sanctuary.

Preserved portions of Athens's ancient defenses are on display in a subterranean parking garage.

This 18th-century former mosque held the first Hellenic Parliament.

The ruins of an ancient mansion sits in front of and underneath a contemporary art gallery.

A preserved portion of an ancient Athens barrier is displayed in a hotel basement.

Tiny historical streetcars wind through a small scale version of Crescent City in this whimsical train garden.

This fairytale-looking castle is a wonderful example of Greek neo-Gothic architecture

This slumbering beast honors the Bavarian soldiers who died in Greece during a 19th-century typhoid outbreak.

The historic building has preserved human organs, unusual hexagrams, and scars from a political assassination.