This cave was the former seat of power for two brothers who ruled together as kings.

Marvel at this massive waterspout fueled by the incoming tide.

This stone obelisk is a relic of the 17th-century Swedish mile markers.

These old towers extract salt from the sea.

A small fishing village hidden inside a rocky cave overlooking the sea

The four landings commemorate a royal visit to Europe's biggest observatory.

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

The final resting place of the father of modern biological taxonomy.

A small church in Uppsala hides the grave of a renowned 18th-century astronomer.

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

You can soak in three relaxing pools filled daily by the tide.

The four-story mural is the centerpiece of a lavish hotel's lush atrium.

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

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

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

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

A beloved street vendor is memorialized outside a German train station.

A 1:2 billion-scale solar system leads visitors into this German university town.

The scars of World War II are preserved on its walls.

The telescope that discovered Neptune.

One of the most easily accessible examples of the rare 1960s UFO houses.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

The history and future of cannabis.