This fantastic cave remained unexplored until 1948 when three schoolboys discovered a hidden entrance.

A former top secret military tunnel is now stuffed with snow and open year-round to skiers.

This small town's local tradition is to create the world's tallest ice pillar.

This castle ruin in the middle of nowhere is a gem for wildlife enthusiasts.

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

A steel paper plane is all that remains of a crashed aircraft that caused an amazingly small amount of damage.

A long-disputed lighthouse built on the wrong side of a Finnish/Swedish island.

A forest of immensely tall and unusually straight oak trees planted nearly 200 years ago to build naval ships that never came to be.

The scars of a remarkably organized public protest to save 13 elm trees are still visible in this Stockholm park.

This cobblestoned medieval-style town was entirely constructed in the 1990s and 2000s.

A former suicide bridge is now accumulating symbols of love instead of a body count.

In the town of Åtvidaberg, the midday sun sets off a loud cannon boom.

Enigmatic bug-like sculptures mystify drivers along a Swedish highway.

This Swedish astronomical clock was in storage for almost a century before its glorious workings were put on display once more.

This trio of stone spires claims to be the only preserved medieval execution site in Europe.

"Only the dead get off at Kymlinge."

Despite the groans of archaeologists, this astounding groups of Bronze Age petroglyphs have been painted red for tourists.

A museum dedicated to the history of psychiatric treatment featuring a gallery of art made by patients.

The single richest source of elemental discoveries in the world.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

Said to be one of Sweden's most haunted places, this vicarage once even attracted a ghost-busting priest.

This Swedish automobile graveyard is a beautiful gallery of decay, but woe be to any who would steal a souvenir.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

A peat bog in southern Sweden provides a cozy and photogenic home for junked Volvos, Saabs, and the occasional American muscle car.