A striking public sculpture representing the period of martial law in Communist Poland.

Ancient burial grounds of the wealthy.

The silly symbol for an underground protest group is now scattered around the city.

Mysterious craters may have been home to an ancient cult.

A cathedral resurrected from the ashes of one of Europe's greatest urban fires.

Largest island in the Baltic Sea experiences such idyllic weather that roses bloom in the middle of December.

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

Not quite the cultural gateway between China and Sweden its designer imagined.

The world's largest model of our planetary system.

It houses the remains of a 17th-century version of the Titanic.

Sweden's oldest animated sign is still lighting up the skyline today.

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

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

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

"Only the dead get off at Kymlinge."

18th century opera in its original splendor.

This wonky bit of historical taxidermy is experiencing a second life online.

The remnants of a record-setting industrial bucket system can still be found dotting the Swedish countryside.

Stone carvings record the Norse myth of Sigurd, providing a glimpse into Scandinavia's transition from paganism to Christianity.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

This "floating railway" is one of the world's oldest monorail systems.

According to legend, this boat-shaped henge is built over the grave of a mythic king.

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

The Goose Girl of Göttingen, Germany might well be the most kissed girl in the world.