Places conordgallagher Wants to Go

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Mountain where Jesus was first tempted by the Devil.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

Shrapnel, dynamite, bullets and Franco couldn't destroy this bust, rescued and kept hidden as a family secret for over 40 years.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

The lengthy skeleton of one of the tallest Spaniards of all time is on display in Madrid.

Commonly acknowledged as the only public monument to the Devil himself.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

An ancient Egyptian temple in the middle of Madrid, Spain.

The heroic sled dog of the 1925 serum run is preserved in taxidermy.

A gated cross stands on the site where an Irish revolutionary met his end.

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

A standing relief of a Norman knight whose posture marks him as a Crusader.

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

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

A strange egg in a mucky bog of western Ireland marks the spot of an aviation milestone.

A remarkably intact castle that once was the largest in Ireland.

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

An abandoned faux-pub made famous by a Guinness commercial.

An ancient holy well said to be used by the patron saint of sailors and travelers, lost in the boggy west of Valentia Island.

An important pilgrimage site for pagans and early Christians, named for a Celtic goddess-turned-saint.

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