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

The first monument in Estonia that was made by an Estonian sculptor.

This set of concrete chambers resonates according to different notes of octaves.

This striking memorial is one of Estonia’s most controversial Soviet leftovers.

A medieval setting reimagined into a unique art alley.

Relics from an era long gone, sit idle outside this Estonian museum.

A forest park outside Tallinn full of architectural and artistic curiosities.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

Pigduck of Turku.

Finnish lake, and scene of an infamous murder mystery.

A replica of the home of a famous fictional troll family.

Hidden deep in a forest is this geological wonder carved by glaciers.

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

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

Museum preserving torture methods from the past.

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

Looming communist pillar with a Czech twist.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

This doorless 20th-century elevator doesn't stop or slow down.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

What looks like a suicide in progress is actually a statue of Sigmund Freud.