These mysterious mazes carved on the rock may be up to 4,000 years old.

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

This Danish rock field is actually a sprawling ancient cemetery holding the bodies of 700 Vikings.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

A stone in Wolin, Poland, marks the possible location of a legendary Viking fortress.

Abandoned boats decaying in the largest ship graveyard in mainland Britain.

One of the largest sculpture collections in the U.K. features history's greats, from Bob Dylan to Galileo, in bronze.

A traveling Bronze Age sacrificial stone that was used to honor elves, fairies, and other woodland spirits.

The first thermometer made with the almost-universal temperature scale is backwards.

This 2,000-year-old stone maze is one of the oldest in the country, but its purpose is still a mystery.

This runestone once destroyed by an explosion has been painstakingly reassembled to save its history.

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

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

This museum of Viking vessels allows visitors to take a replica out for a spin.

A rare rune stone dedicated to a woman.

A large collection of ancient runestones decorates this university courtyard.

Legend says this fabled well held part of a mythical Norse tree.

The ruins of a monastery where Saint Bridget of Sweden had her revelations recorded.

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

This mysterious runestone embedded in a church wall is linked to the medieval cult of Saint Erik.

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

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

The suspected burial mound of legendary Viking Björn Ironside.