A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

Giant marble phalluses on the sacred island of antiquity.

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

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

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

A spectacular cave and a beguiling lake.

The hallucinogenic center of the ancient world.

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

Through the colossal entrance to this cave you'll find limestone tubs and an underground waterfall.

An idyllic traditional timber village on a picturesque hill was built for a film.

The ridged layers that make up this river canyon represent Earth's geological history.

A Roman monument to their own civil engineering prowess.

This fresco-covered medieval monastery hangs from the side of a steep cliff.

Popular river that runs through the remote Serbian municipality of Leskovac.

Serbia's master of striking memorials erected a forgotten, hidden gem in the hills outside a tiny village.

The interior of this Serbian royal family's mausoleum is covered with exquisite mosaics.

Religious perseverance and cultural coexistence manifest in an architectural gem that multiple wars couldn't topple.

The bizarre rocks of Đavolja Varoš are the result of natural erosion.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

A sinuous path among steep cliffs creates a stunning sight in southwestern Serbia.

Legends of treasure and spirits flow from this this fairy tale-like oasis.

Structure built from the skulls of vanquished foes.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

A crumbling World War I fort that is reached through a series of concrete tunnels.