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

A beautiful but toxic fountain of mercury.

This semi-secret storybook hedge maze is also the oldest garden in the city.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

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

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

This World War II relic let Allied pilots know they were entering neutral airspace.

This Bronze Age tomb is the centerpiece of a clearing within a beautiful Irish forest.

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

This natural sea arch highlights Ireland's rugged coastal beauty.

Catholics make up 84% of Ireland's population but this Dublin museum remembers the small but important Jewish community.

A stone wall that mysteriously moved three feet from its foundation.

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

A proud bronze billy stands as an eternal symbol of Ireland's oldest festival, where a goat is made king.

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

A spectacular hidden beach in Ireland has the dark, disturbing nickname of "Murder Hole Beach."

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

The oldest licensed distillery in Ireland.

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

Petrified footprints of one of the very first vertebrates to walk on land.

The world's tallest box hedge is found in a delightful garden.

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