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

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

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

Dynastic Home of the De Piro Family.

After 400 years of being closed to the public, this monastery's underground tunnels and secret garden are now a museum.

Valletta’s outdoor theatre stands within the ruins of a 19th-century opera house.

Both the World War II Allied Forces and NATO have used this modern bunker underneath Malta’s capital.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

The bones of prehistoric animals and early signs of human habitation have been found inside Malta's "cave of darkness."

A 16th-century Andalusian palace.

Spain's largest bullring offers a unique glimpse at architecture and history.

The world's largest wooden structure.

Get a taste of Chamorro cuisine, family-style, at this popular restaurant.

Designed to commemorate the king's coronation.

Experience what life was like in Ireland during the Viking and medieval ages.

A mysterious plaque to the even more mysterious "Fr. Pat Noise," killed in "suspicious circumstances."

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

The block of aged dairy is probably still edible after 2,300 years in a peat bog.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

An enigmatic monument to the Irish revolutionary who plotted an uprising against British rule.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

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

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.