The mysterious large white cross visible from the runway is a memorial to a massacre during Spanish Civil War.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

A brisk climb up this solitary peak leads to the origin story of a towering figure in Irish history.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

Two small chapels housed inside an ancient tree.

The world's largest boar is a huge steel titan found at a French rest stop.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

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

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

The odd depiction of the Virgin Mary and baby Jesus is rooted in the Catholic Church's eradication of Catharism.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

This modest plaza in Moneygall, Ireland has cashed in on its distant connection to the U.S. president.

Five candy-colored villages on the Italian Riviera.

An enormous and lavish Gothic church in Czechia.

A hugely vast Irish landscape of barren rock that stretches for miles.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

See some of the world's greatest racing horses at this idyllic thoroughbred breeding facility and garden complex.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

A corkscrew-shaped barn in Ireland.