There are hidden patterns on the subway seats of some Stockholm metro cars.

A medieval setting reimagined into a unique art alley.

"There's nothing there," and other lies the KGB told us.

This former medieval prison now unlocks Estonia’s rich photographic history.

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

The oldest continuously operating pharmacy in Europe.

A secluded art gallery hidden within the cellars beneath Tallinn’s medieval monastery.

Only a fragment of this 15th-century Dance of Death survives today.

The final resting place of the man whose name has become synonymous with greatness.

From a distance, this structure looks like an ordinary office building but a closer inspection reveals a unique facade.

A water reservoir disguised as a castle stands atop a hill in a park in Stockholm city.

Not far from the busy city lie these remains of a time when the world was on fire.

This building, previously used as a courthouse, has an unusual geological feature in its basement.

A concrete mushroom that divided Stockholm residents for nearly a century.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

The fastest way to send a message before electricity was invented.

A statue that stood at the center of a long copyright battle.

This Viking Age memorial contains the oldest known image of a Täby resident.

A medieval church that contains murals from famed artist Albertus Pictor.

A temporary art piece to celebrate LGBTQ Pride is now a permanent part of Stockholm's traffic landscape.

This poured-concrete water reservoir is a gem of modernist architecture well-hidden in a city forest.

This unique sculpture is often overlooked by pedestrians.

Every Tuesday, students let off steam by screaming into the night air.

Enormous ants wielding giant pine needles guard a Stockholm real estate company's office.