A sprawling collection of books and manuscripts about ancient Greece that would have put their famed libraries to shame.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

Dating back almost 400 years, the oldest public collection library in the United Kingdom was once the study hall of Karl Marx.

19th century museum with an eclectic mix of curiosities, from Egyptian artifacts to items on archery history to the skull of the world's oldest horse.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

The ruins of a once-grand mansion in Northern Ireland are now thought to be haunted.

This gnarled old tree supposedly sprouted from seeds kept in the pocket of a 16th-century Spanish sailor.

Artifacts and exhibits tell the story of a small town that has punched above its weight and influenced history.

Just a few miles off the western coast of Ireland lies an isle steeped in Irish literary history.

Local legend says there's treasure hidden within its crowded graveyard.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

A massive Celtic cross secretly growing in an Irish forest.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

This single room has survived the centuries with almost no deterioration.

The skeleton of a whale that beached itself in this Irish town is now on display in their public park.

Just another ancient, mysterious Irish stone circle.

This natural sea arch highlights Ireland's rugged coastal beauty.

This Irish museum in a historic 19th century market pays tribute to the glory of butter.

The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

Certain traditions prevail on the least-visited island of the Aran Islands.

The remains of this deep, dark mine have left behind a haunting rocky warren of tunnels.