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

The ruins of a medieval monastery named after a type of tree.

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

A stunning Victorian abbey and walled garden on a lakefront.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

This 19th century hydroelectric powerhouse was the first of its kind.

Before it was abandoned and left to rust alongside the road, this riverboat starred in a John Wayne movie.

Pillars made of 700 pieces of luggage climb to the ceiling of Sacramento Airport's baggage claim.

A sweet symbol marks the place where torturous executions were once carried out.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

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

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

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

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

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

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

Here, at the “world’s longest art gallery,” you’ll find forty miles of ancient petroglyphs and pictographs.

A trash dump made beautiful by nature's power.

Legends surround this jagged rock formation in the New Mexico desert.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Small Nevada town embraced its designation as the "Armpit of America" with an Old Spice-sponsored festival.

The drama of nature in full effect in this Nevada State Park.