The wilderness of northern Sweden is full of shelters to protect people from sounding rockets returning from space.

Believed to be the country's tallest waterfall, the Njupeskär is actually much smaller.

A Chinese meditation center in the middle of rural Sweden, partly funded by a member of ABBA.

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

A centuries-old iron mine is now a paradise for explorers, divers, and spelunkers.

The ruins of a monastery where Saint Bridget of Sweden had her revelations recorded.

A botched 18th-century canal silenced one of Sweden's most magnificent waterfalls.

An eclectic sculpture park rises atop a giant pile of ashes in Sweden.

The world's only above water sand volcano, believed to once be the bathtub of a priest.

The concrete skeletons of an abandoned Swedish town hide among the trees.

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

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

The second oldest anatomical theater is housed in a museum of curiosities.

The single richest source of elemental discoveries in the world.

"Only the dead get off at Kymlinge."

This chimerical bridge/tunnel appears to dead end right into the sea.

Micro-nation based around a nine-story high illegally built tower.

The remains of Alfred Nobel's first nitroglycerine factory can still be found on the shores of a Swedish bay.

Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

A series of modernist treehouse hotel rooms grace the outskirts of an Arctic forest.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

The library's graceful rotunda is like a bibliophile's temple.

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

A huge Soviet-era robotics factory in the outskirts of Pripyat, now long-abandoned.