This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

An 18th-century post box used to alert the church of sick and ailing foreign pilgrims.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

The yawning maw of this pagan visage is said to bite off the hands of liars.

An elaborate Romanesque archway, built right before the British occupation of Ireland.

The remains of a 13th-century Franciscan friary have survived multiple attempts at destruction, most recently in 1921.

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

After being destroyed by IRA sympathizers, the ruins of this stately Irish manor have sat vacant for decades.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

An unusual manor of stunning beauty, born out of a crippling disease.

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

Wander among the abandoned ruins of this once-powerful medieval town.

The ruins of a monastery that dates to the 7th century.

The remains of a majestic house that was once stood in the crosshairs of the Irish Republican Army.

Follow lines from a W.B. Yeats poem through interconnecting gardens designed to appeal to each of your senses.

Oliver Cromwell once seized the land under this house, which included the ruins of a medieval abbey that the owner used to build his stately home.

This Bronze Age tomb is the centerpiece of a clearing within a beautiful Irish forest.

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

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

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

This ancient Irish landscape boasts hundreds of legendary ruins.

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.