This hidden collection of everyday objects illustrates life within communist Poland.

At night, this memorial illuminates a ghostly outline of a footbridge that connected two sections of the Warsaw Ghetto.

The last king of Poland was interred in this church nearly 200 years after his death.

A statue honors the children who fought Nazis in Poland.

Legend says this is actually a heartbroken prince waiting for his true love's kiss.

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

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

This colorful and quirky set of pegasus sculptures celebrate the works of poet Zbigniew Herbert.

This man-made mound monument was built out of soil from all across the Polish empire.

The official meeting point for the oddly named governing assembly of ancient Sweden.

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

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

Sweden's "good old days" painstakingly re-created in a model village.

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

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

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

What looks like a birch tree smushed between two pieces of glass often confounds commuters.

This pair of unsuspecting buildings are in fact the very first modern skyscrapers in Europe.

A golden plaque marks the site of the mysterious unsolved assassination of the former Swedish prime minister.

An abstract representation of weather in Sweden.

A Japanese video game arcade hides in the back of a Swedish pool hall.

Relive a Polish uprising via an enormous, century-old cyclorama.

This oddly beautiful water cistern is a techno-temple to the wet stuff and a multimedia masterpiece.

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