These rare statues are one of the few remaining material witnesses to Old Prussian culture.

This antique thermometer honors the creator of the first universal temperature scale.

This 13th century Gothic brick castle is the largest in the world by surface area.

This statue and park honor the Swedish chemist Jacob Berzelius, one of the founders of modern chemistry.

Stockholm's narrowest alley is barely over two feet wide.

A subterranean house of worship carved right out of the bedrock.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

Once silenced for being off-key, this bell has found a new voice as an interactive public artwork.

This floating sculpture of ice is a poignant reminder of nature's power.

If you visit Santa's village, you can get your passport stamped to show you crossed into the Arctic Circle.

A medieval village, with red wooden cottages around a stone church, stands as a well-preserved example of a settlement type that was once common in northern Sweden.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

A silly medieval mural preserved on the side of a Viennese house.

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

These two 15th-century metal rods allowed people to check if they were swindled or not.

Legends surround an ancient tree trunk riddled with nails for good luck.

On a winding Vienna side street, one museum has turned their windows into a monument to history’s peace-minded heroes.

One of Vienna’s oldest (and perhaps most haunted) alleys, allegedly with a bloody past that gave it its name.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

Baroque celebration of the end of the Great Plague of Vienna.