A spectacular hidden beach in Ireland has the dark, disturbing nickname of "Murder Hole Beach."

Cold storage for agricultural biodiversity.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

"There's nothing there," and other lies the KGB told us.

This abandoned fighter jet launch center is now a haunting street racing course.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.

Ancient paintings known as the "Sistine Chapel of Cave Art."

Natural cathedral designed by Italian artist Giuliano Mauri.

This half-finished "city of toys" was almost Italy's own Las Vegas.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

A decommissioned submarine base makes a great space for graffiti art.

Abandoned Soviet base once stocked with short and medium range missiles pointed at western Europe.

A corkscrew-shaped barn in Ireland.

An 1814 castle that hosts an exhibit of "explorabilia".

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

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

Obelisks and stone pineapples in the Irish countryside.