The remains of a sunken military ship wreck visible through clear water.

Yugoslavia's biggest underground airport lies in ruins.

A wonderfully strange collection of 500+ stuffed frogs doing people things.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

A musical instrument played by the sea.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

An ethereal glowing blue ocean cave in Croatia.

An ancient neolithic tomb that only sees the sun twice a year.

A moody and picturesque riverside ruin overgrown with vegetation.

A remarkably intact castle that once was the largest in Ireland.

Obelisks and stone pineapples in the Irish countryside.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

Local legend says the remains of Father Christmas lie within the medieval grounds.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

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

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

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

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

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.