Built in 1547, these ruins lie on a rocky promontory in Ballintoy jutting into the wild ocean waters below.

Originally built to monitor fishing, this Victorian tower now educates visitors about the local salmon industry.

This cemetery overlooking the Benbulben rock formation is the final resting place of one of Ireland's most beloved poets.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

A stunning Victorian abbey and walled garden on a lakefront.

Japan's largest collection of Western-style mansions in the port city of Kobe includes a recreation of Sherlock Holmes' 221B Baker Street quarters.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

This bridge is so steep it looks like a rollercoaster.

The hometown of a beloved manga artist created a treasure hunt for his popular ghostly characters.

A sobering scientific reminder of the human damage caused by the advent of the nuclear age.

The statue's head is one of the few fragments of the original Urakami Cathedral to survive the atomic bomb.

Japanese national treasure originally built in 593 CE.

An eerie reminder to the horrors of World War II.

Peace Park and the Atomic Bomb Dome.

The tallest bronze seated statue of the Buddha in Japan.

Inspired by the famous sculptures on Easter Island, this head serves as a popular meeting spot by Shibuya Station.

The lake that fills and empties itself at random.

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

The statue honors a beloved bird that once roamed St. George's Market.

These barriers stand as stark reminders of Northern Ireland's troubled past.

An early 20th-century bullring converted into a modern shopping center.

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.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.