This abandoned urban warfare facility is a dream come true for airsoft and paintball enthusiasts.

The second-largest collection of runic calendar staffs in Sweden.

This serene wooded hilltop has a dark history as the climactic point of the Swedish witch trials.

This massive Trojan ursine was built to be a new tourist symbol for a small Swedish town.

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

Part of an abandoned19th-century fortress hides in plain sight inside a modern office building.

This abandoned Swedish folkpark offers an amazing view over the town of Överkalix.

This collection of Dwarf beech trees were once believed to be enchanted trolls in disguise.

This railroad track was so secretive that it was omitted from all maps.

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

Tucked away in a downtown Stockholm park are the remains of a World War II defense position.

A simple stone remembers one of the most menacing horses in the Swedish military.

The dome-shaped reservoir of this old water tower produces unique acoustic effects.

This tiny Swedish troll protects the land and all who wander within it.

Known locally as the Jungfrutornet, this Medieval tower hides a dark legend.

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

This patch of land is home to Sweden's largest burial mound, allegedly belonging to a mythical king.

An ancient tree that was once the favorite of a young Swedish royal.

Hidden in plain sight, Sweden's official ordnance datum is now abandoned.

A catapult rock from Gotland’s 13th-century civil war is still lodged in Scandinavia's best-preserved medieval city wall.

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

This small town's local tradition is to create the world's tallest ice pillar.

These mysterious circular formations are actually remnants of 19th century gristmills.

Sweden's southernmost prehistoric rock art is hidden just outside Gothenburg.