Dublin's "Dead Zoo" serves as a window to Victorian museum design.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

An alien landscape on the banks of the Aegean Sea.

An autonomous republic of Orthodox monks.

These ruins in Volvi were once at the intersection of the Eastern and Western Worlds.

Cave on extinct volcano, once home to famous mathematician Pythagoras.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

A cave network located at the southernmost tip of mainland Greece was once believed to be an entrance to Hades.

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

Hideout of thieves, monks, and goat-footed gods.

This remarkable cave was discovered after a shepherd watched bees enter and exit through a small fissure.

An ancient octagonal weather station named for the eight Greek gods of wind.

Ancient Greek oracle of the dead.

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

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

Local legend says the remains of Father Christmas lie within the medieval grounds.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.