The UK's oldest theme park slowly slips away.

The ruins of a medieval monastery named after a type of tree.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

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

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

Experience what life was like in Ireland during the Viking and medieval ages.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

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

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

A charming beach town in Turkey captures all the colors of the rainbow.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

This automated sculpture of two men peeing will spell out text messages with their micturition.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

The first museum in the world devoted to sexual gadgetry.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Macabre astrological automaton clock dating to the late 1400s.

Two stunning 17th-century libraries and a cabinet of curiosities.

This endearingly discomfited urinating statue commemorates the sneaky pees had by us all.

A subterranean house of worship carved right out of the bedrock.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.