An eccentric home in Sicily turns heads on a regular basis.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

What was once an underground Nazi city is now Europe's largest bat reserve.

This abandoned railroad tunnel is now home to a micro-colony of bats and a ghost train.

An unfinished rail tunnel that has since been used to house cheese and bats.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

A stunning bridge that appears as if it's lunging to the shore, and has a legend of a devilish architect.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

Local lore says the devil built this beautiful medieval bridge to help a fleeing bandit.

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

A mysterious bridge over a sunken Roman road.

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

Hidden in Carnfunnock Country Park is a lasting testament to the Normans who once settled in the region.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This 600-year-old home seems to defy physics.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

The last bastion of Roman presence north of the Alps looms over a German town.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

This bakery and museum offers tours of the tastes and mythology of Aachen's signature spice biscuit—just don't ask for the recipe.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

Inside this Jewish cemetery is a memorial to soldiers who deserted the German army and were executed.

Is this statue at Naumberg Cathedral the fairest of them all?

A ruined castle stands atop a hill surrounded by dragon lore.