A small etching on the white marble parapet was written in runic script by a Viking mercenary.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

This famous city eluded concrete detection until the early 2000's.

A marvel of Byzantine engineering under the streets of Istanbul.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Roman ruins top white travertine terraces formed by ancient hot springs.

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

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

France's most famous cemetery, with some of its most curious tombs.

Guatemalan womanizer, venerated during Holy Week.

These roaring primates were considered a divine creature in the cosmology of the Maya.

Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

One of the world’s most colorful cemeteries, where each pigment is symbolic.

These moss-covered medieval ruins tower atop the smallest of Ireland's Aran Islands.

The ruins of a medieval monastery named after a type of tree.

The modern birthplace of Irish freedom.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

A hugely vast Irish landscape of barren rock that stretches for miles.

A steam trawler with a whiskey-soaked history driven ashore in 1960 resides rusty but still standing on the shoreline.

Certain traditions prevail on the least-visited island of the Aran Islands.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.