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

A fountain standing as a testament to a doomed alliance.

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

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

A sixth-century Byzantine cistern hidden below a modern carpet store.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

The ancient latrines of the Greeks, in all their public glory.

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

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

A marvel of Byzantine engineering under the streets of Istanbul.

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

This mountain fissure hides a secret path to a secluded mossy grotto within the rock itself.

Cairns built to bring travelers good luck stretch across the land like miniature stone mountains.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

It's easy to forget what century it is as you wander this rustic homestead.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

A downtown park built on top of unclaimed graves.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

This beautiful, historic church looks like something out of a simpler past.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

A formerly glacier-tipped volcano that inspired none other than Jules Verne.