One of the most photographed locations in the entire city.

This field of half-buried stone crosses was the burial place of a sect of heretical gnostics.

The secular incarnation of a religious meditation.

This legendary city has been a tourist attraction for centuries.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

This Greek Orthodox church houses the mummified body of St. Spyridon.

An islet filled with wooden houses where the open sea meets a lagoon.

This 13th-century monastery chiseled into the side of a mountain is equipped with a bridge that can be lifted to protect against raids.

A museum inside a Byzantine island monastery.

A lake island of richly decorated monasteries, where a fugitive ruler met his end

Abandoned and overgrown town with views of the Mediterranean Sea.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

This little-known, 35,000-specimen collection in Greece is a lepidopterist's dream.

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

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

A spectacular cave and a beguiling lake.

The largest and most famous wax anatomical collection anywhere in the world.

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

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

This grubby wall is said to be one of the Earth's esoteric energy centers.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Krakow's own version of the Hollywood Walk of Fame.

Where visitors can play more than 150 retro arcade games.