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

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

This single room has survived the centuries with almost no deterioration.

An ancient holy well said to be used by the patron saint of sailors and travelers, lost in the boggy west of Valentia Island.

Petrified footprints of one of the very first vertebrates to walk on land.

Just a few miles off the western coast of Ireland lies an isle steeped in Irish literary history.

Ancient barriers wrap around what was once an important stop along the Silk Road.

Belfast's namesake river still winds below the city center, hidden from sight.

Featuring the last fully walkable parapet walkway in Europe.

Some of the saint's blood and bones are said to reside in Dublin.

The social hall of this former factory is a Communist-era time capsule.

The avant-garde design was able to bypass strict Soviet regulations on architecture.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

Two graffiti towers stand like ghosts of Vancouver's World War II-era defensive outpost.

The "Black Arch" guards the entrance to the picturesque Glens of Antrim.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

It was meant to help transport wounded soldiers to a secret underground hospital.

Tucked away in a downtown Stockholm park are the remains of a World War II defense position.

Sweden's "good old days" painstakingly re-created in a model village.

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

This homeless brass fox tugs at your heartstrings from the foot of a Stockholm bridge.

The Swedish flag over this small naval fort signals that the nation is at peace.

Rock-cut cave complex filled with ancient Buddhist artwork.

The internet as provided by a James Bond villain.