A merchant court dedicated to the fictitious King Arthur is heavily adorned with bizarre Renaissance art.

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

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

A mysterious emblem tucked in an small alleyway is actually the coat of arms of a heroic medieval family.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

The site of the first battle of World War II.

Boats must transform into railroad cars to navigate this Polish canal.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

A miniatures park with a model of Wolf's Lair as it looked during World War II.

A small granite monument marks where the borders of three countries meet.

This lonely Lithuanian chapel looks more beautiful and haunting in decline than it ever did in life.

An abandoned 14th-century castle and prison complex on a small island in the Neva River.

A homemade anatomical collection of medical anomalies and accidental catastrophes.

This 15th-century cave complex is one of the very few monasteries to stay open throughout World War II and the Soviet regime.

Crooked windswept pines give this old forest an enchanted and magical look.

Few would expect the world's oldest preserved oil refinery to be found in Sweden.

One man's fascination with Turkey led to this backyard mini-city.

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

18th century opera in its original splendor.

The world's largest model of our planetary system.

Stockholm's tiniest statue is of a small boy looking at the Moon.

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.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

Stockholm's deepest subway station is also a stunning ecological wonder.