Despite the name, this 16th-century structure in Galway wasn't built by the Spanish.

The ruins of a sixth-century monastery sit on the banks of the River Shannon.

These moss-covered medieval ruins tower atop the smallest of Ireland's Aran Islands.

This European portal tomb has a capstone that weighs around 150 tons.

On the Irish coast, 18 members of the Howard family are eternally resting in an Egyptian pyramid.

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

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

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

A stunning Victorian abbey and walled garden on a lakefront.

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.

More than 5,000 artifacts donated by the people of the city, plus a room entirely devoted to the band U2.

An ancient neolithic tomb that only sees the sun twice a year.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

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

One of Ireland's most infamous prisons for rebels including men, women and children.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Mountain where Jesus was first tempted by the Devil.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

A beautiful but toxic fountain of mercury.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

There might not be much left of these Irish ruins, but their linguistic legacy is still going strong.