This cannonball embedded in the side of an Edinburgh house once served a surprisingly pedestrian purpose.

360° views of the city plus five floors of optical illusions and hands-on science.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

The oldest floral clock in the world still functions today.

Ruins battered by centuries of war and disaster offer a wondrous glimpse of medieval Ireland.

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

An Irish town has built a statue to a silent film actor simply thanks to the holidays he once spent there.

Inside Cork's Kent station stands its country's longest-serving postbox.

This 19th-century prison once held Irish revolutionary Constance Markievicz, writer Frank O’Connor, and a nine-year-old pickpocket.

This statue celebrating everyday life in Dublin has a few unsavory nicknames.

A guitar mounted on a wall in Temple Bar honors the Irish musician.

The modern birthplace of Irish freedom.

This is the place where U2’s lead singer got his nickname.

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

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

Boise State's stadium was the first non-green football field in the world.

This tiny man looms large over downtown Charleston.

The tallest waterfall in West Virginia.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

A humble plaque marks the site where the country music legend was found dead in his Cadillac.

Forget Hollywood, one of the biggest stars in the world can be found in Roanoke, Virginia.

Dine in a former general store from the Roaring Twenties, when Eggleston was a hot springs boomtown.

A sprawling cave network created by a lone lava tube.

Oregon's only closed-basin hypersaline lake, an important stopover for migrating waterfowl, is in danger of drying up completely.