The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

An eclectic collection of thousands of items owned by the sculptor Frederic Marès.

A dreamlike medieval church dug into the tuff rock, with unusual carvings and possible traces of the Templar knights.

A fascinating assortment of cave dwellings, medieval ruins, and sarcophagi are being devoured by the forest.

The oldest of the three remaining bridges in England with buildings on top of them.

This fairytale medieval church in Poland originally spent centuries in Norway.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

A 12th-century church with a medieval fresco and an intriguing “Greek runestone.”

Now a memorial to merchant sailors and Titanic victims, this medieval church was destroyed by bombing raids in 1940.

This Gothic church houses ornate royal tombs and a magnificent gilded altarpiece.

Houses are tucked between, on, and underneath giant boulders.

Also known as Rye Castle, this 13th-century fortification later became a prison and held one of Rye's most famous criminals.

This Norman castle was once the site of a Victorian-era prison, and now exists as a luxury hotel.

This 13th century Gothic brick castle is the largest in the world by surface area.

This medieval mountain town is also known as the "Village of Streams."

This castle resides in a valley known for immense bloodshed during the Middle Ages.

Inside this medieval church resides a unique set of murals.

A fascinating and enormous collection of natural history exhibits stained by a dark colonial legacy.

This 15th century pub is one of only two pubs in England situated on consecrated ground.

Potato-peeling mannequins, Inca art, and a dangling tuber mobile help trace the history of fries at this Belgian museum.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.