A painting to honor the oldest reserve squadron in the Royal Air Force.

This former World War II torpedo testing location is now an important nesting site for migratory birds.

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

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

After being destroyed by IRA sympathizers, the ruins of this stately Irish manor have sat vacant for decades.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

The home of Ireland's last leprechauns is officially protected by the European Union.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

The oldest public library in Ireland.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

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

The ancient tomb acts as a calendar that keeps perfect time.

This pair of gilded girls atop an Art Deco building in Copenhagen were built to function as a weather indicator.

Site of the first radio and telephone broadcasting companies in Copenhagen.

Museum on earth sciences featuring a recreation of a famous curiosity cabinet.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

Not actually a shop, but one fan's passionate show of support for a rival county's Gaelic football team.

An unassuming historical marker for an iron age fort leads you to an oddly adorned cemetery for unbaptized children.

The largest stone circle in Ireland.

The remains of a 13th-century Franciscan friary have survived multiple attempts at destruction, most recently in 1921.

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

This small Irish village suffered the greatest loss of life when the Titanic sank.

Behemoth, cannon-like telescope operated by generations of Irish earls.