A small but stubborn relic of Spain’s turbulent past hides in plain sight.

A tunnel commissioned by ‘the Intruder King’ to escape from the palace if there were problems.

Finally reunited, the three effigies now stand in a museum courtyard.

This grisly exhibit houses skeletons and weapons from a devastating 14th-century clash.

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

Early habitat dioramas and home of the elusive gaff, the skvader.

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

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

The palace for King Gustav III was never completed, but the foundation remains tucked away in this city park.

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

A former suicide bridge is now accumulating symbols of love instead of a body count.

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

This statue and park honor the Swedish chemist Jacob Berzelius, one of the founders of modern chemistry.

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

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

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

A king's bloodstained shirt is among the gruesome collection of artifacts displayed below Stockholm's Royal Palace.

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

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

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

Sweden's oldest animated sign is still lighting up the skyline today.

This unique sculpture is often overlooked by pedestrians.