This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

A sacred well steeped in Pagan roots on the West Coast of Ireland.

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

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

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The final resting place for a wealthy Roman family, this tomb might be the best preserved of its kind outside Italy.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

The fairy tale castle of the "fairy-tale king."

The prototype for all Nazi concentration camps.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

This symbol of the French Revolution still stands where it was first planted during the 18th-century.

The mummified heart of Louis XVII, the lost dauphin of the French Revolution.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

How did a French journalist’s grave become the sexiest statue in the cemetery?

France's most famous cemetery, with some of its most curious tombs.

This demon atop the Notre-Dame de Paris looks utterly bored.

A medieval replica of King Arthur's legendary table, the Round Table hanging in Winchester Castle was decorated by Henry VIII.

This silent sentry in the crypt below a large Gothic cathedral is often knee-deep in water.

An impressive armored bronze effigy marks the tomb of one of the medieval era's greatest warriors.

One of England's most famous churches hides a pair of little known architectural treasures.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.