A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

This ancient Spanish castle sits high upon a hilltop.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

The final resting place of the great navigator, or maybe his brother.

A lush indoor jungle fills this bustling Madrid transportation hub.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

A fortress off the West coast of Portugal that dates back to 1502.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

Home to three historic ships from the age of Vikings.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

A stunning Victorian abbey and walled garden on a lakefront.

A particularly disconcerting tribute to Irish martyrs.

The modern birthplace of Irish freedom.

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.

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

Certain traditions prevail on the least-visited island of the Aran Islands.

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

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."