Legend has it that this large rock maze in Sweden was created as punishment by the daughter of a wealthy captain.

This simple roadside art installation ended up sparking a folk art movement and a controversy of international proportions.

Inside this church, a monument honors the first burial site of the famed philosopher.

One of the world's first dedicated bank buildings in the world is now the oldest one.

Several cannonballs of mysterious origins decorate two buildings in Stortoget's main square.

This small museum nestled inside a souvenir shop is dedicated to Sweden's most well-known toy.

Hidden in plain sight, Sweden's official ordnance datum is now abandoned.

This centuries-old rooster survived a devastating fire.

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

This small statue hints at the incorrect origins of the lush landscape park surrounding it.

The final resting place of more than 200,000 people, this is one of the largest cemeteries in Europe.

A 20th-century picture show in 3-D.

An 11th-century runestone decorates the halls of Terminal 2 of this Scandinavian travel hub.

One of the world's largest collections of medieval religious art.

A hidden art gallery in an abandoned Warsaw fort.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

A prehistoric geological oddity tucked behind Stockholm's natural history museum.

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

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

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

These 18th-century paintings of Warsaw were used to reconstruct the city after World War II.

In the summer, the area around this sculpture transforms into a vibrant concert venue.