These imposing walls and towers look more like the ruins of a fortress than a monastery.

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

Ruins battered by centuries of war and disaster offer a wondrous glimpse of medieval Ireland.

An outstanding and haunting glimpse of the horrors of the Great Famine of Ireland.

This burial pyramid in central Ireland is thousands of miles and thousands of years away from its Egyptian inspiration.

Just another ancient, mysterious Irish stone circle.

This medieval "painted village" is famous for its geometric facades.

A magical, if a bit tacky, 1960s castle conjures up medieval fairytales and Greek mythology.

This ancient statue of Dionysus lies unfinished and abandoned in one of Greece's oldest quarries.

This smily stone feline is meant to represent a mythical lion that almost destroyed the island of Kea.

The secular incarnation of a religious meditation.

This little Greek plateau is home to thousands of rustic, white-sailed windmills.

A miniature desert appears out of nowhere on the lush isle of Lemnos, like something out of a Greek myth.

A grotesque collection of wax limbs depicting the symptoms of venereal disease.

The historic tower houses of this nearly abandoned Greek town have been compared to the spikes on an iguana's back.

This little-known, 35,000-specimen collection in Greece is a lepidopterist's dream.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

A small island with shimmering pink sands, home to loggerhead turtles and rare plants.

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

Petrified footprints of one of the very first vertebrates to walk on land.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.

The world's tallest box hedge is found in a delightful garden.

This 30-foot pile of rocks may be the grave of a mythological Irish queen.