A tiny chapel clings to a precipice above Germany’s gemstone capital.

Originally a leper colony, the island is now an Armenian monastery that's home to an incredible manuscript library and eclectic museum.

A fairytale island floats in the middle of Italy's little-known Lake Orta.

This picturesque medieval monastery guards a small trove of historic treasures.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

Perched atop the highest hill in Cartagena, this 17th-century convent offers spectacular views of the city.

Explore the atmospheric ruins of an abandoned convent in the dense forests of Mexico's first national park.

This breathtaking monastery was established by Saint Benedict himself 1,500 years ago.

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

A galaxy of glowworms—larvae of a gnat—hides deep in the belly of these caves.

Hydraulic systems in an ancient underground Iranian city.

A mysterious bridge over a sunken Roman road.

Three bridges straddle a stream, one stacked upon the other.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

This 16th-century monastery has been turned into a surrealist architecture compound.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

A stunning hermit's shrine on a steep rocky spur in Northern Italy.

Russian Orthodox church built on an Antarctic island.

A curious cave church carved into the face of a cliff.

Two stunning 17th-century libraries and a cabinet of curiosities.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

A magnificent Victorian garden that brings the charm and style of old-time aristocracy to the 21st century public.

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