One of Ireland's most infamous prisons for rebels including men, women and children.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

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

"The country that ate itself."

A war relic that has sat undisturbed since it crash-landed near Arno Atoll.

The birthplace of both the Atomic Age and Godzilla, and the namesake of the bathing suit.

An enormous concrete structure built over a nuclear crater.

A failed utopia, shut down by a more legitimate nation.

Underwater volcanic eruption forms new island off the coast of Tonga.

Tropical paradise strewn with hundreds of World War II wrecks.

The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.

The ship that got left behind.

Final resting place of the most prolific Fijian cannibal of all time.

The world’s most primitive form of bungee jumping.

Nestled in the jungles of Vanuatu are the remains of what was once a cannibal oven.

The U.S. military dumped millions dollars worth of goods off a beach in Vanuatu, purely to spite the British and French.

Plains of ash and pair of semi-active volcanoes contribute to the otherworldly beauty of this little-known Vanuatu island.

This South Pacific volcano has been blowing its stack for over 800 years and is said to be home to a cult leader waiting to be reborn.

The fully functional, submerged Vanuatu Post Office is definitely one of a kind.

This peaceful path through the jungle is surrounded by songbirds and complete with a waterfall.

A beachside monolith shaped by years of waves crashing against hard quartz.

Marvel of green building techniques that sings with the wind.