The cell which saved the life of Ludger Sylbaris, "the man who lived through Doomsday."

This ancient mountain monastery welcomes all manner of faith in an effort to keep Christians in Syria.

These medieval tunnels provided water to the city above through centuries of civil war and plague.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

This beautiful system of tunnels built into natural rock serves as a centuries old plumbing system.

A small but immensely extravagant palace built by the "Night King."

A self-taught Siberian craftsman creates a fantastical and personal design for his 19th century village house.

The Nazis lost more men trying to take this Russian-held Stalingrad apartment block than they did when taking Paris.

Abandoned castle was once a grand example of Russian privilege, built exclusively to win a frivolous bet between noblemen.

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

Stalin's march toward a more modern USSR flooded a monastery, leaving a unique and extravagant nautical marker, "The Flooded Belfry."

Monastery complex at the location where bodies of the executed Romanov royal family were discovered.

Church built on the site where the last tsar of Russia and his family were killed.

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

The oldest stone house in Paris was built by its most famous alchemist.

Ruins of a German Castle on top of a towering stone pillar.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

The mummified relic of St. Catherine sits forever on a golden throne.

This little-known relic crypt holds stolen parts of a Roman Empress.

This sword isn't waiting for a king to pull it out. It was placed there by a saint.

This Tuscan lake hides a 13th century town that is still visible when the water recedes.