Rare recess caves fill this unbelievably beautiful Ohio park.

Flames have been burning within this mountain for more than 2,500 years.

This single-track road rewards brave drivers with stunning Scottish scenery.

These little-known sands dunes are a geological anomaly in Saskatchewan's southern prairies.

The whiskey producer's archives includes a historical list of infractions committed by and associated penalties exacted upon employees.

A former fortified tower now houses a collection of classic communications equipment.

An Irish peat mine has become a stunning sculpture park.

This World War II relic let Allied pilots know they were entering neutral airspace.

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

An important landmark in the history of algebraic logic.

A massive Celtic cross secretly growing in an Irish forest.

A stunning Victorian abbey and walled garden on a lakefront.

This beautiful site is where the first transatlantic telegraph was sent from.

An Irish town has built a statue to a silent film actor simply thanks to the holidays he once spent there.

The world's only flying boat museum honors a small Irish village that sent 20th-century aviation to new heights.

An abandoned faux-pub made famous by a Guinness commercial.

A stone wall that mysteriously moved three feet from its foundation.

A strange egg in a mucky bog of western Ireland marks the spot of an aviation milestone.

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

Some of the saint's blood and bones are said to reside in Dublin.

The modern birthplace of Irish freedom.

A particularly disconcerting tribute to Irish martyrs.

A devastating booze inferno poured through the streets, claiming several victims who drank it.

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