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

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

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

This 2,000-year-old Doric bridge is still open to pedestrian traffic to this day.

The city of Parma's cathedral is home to one of the greatest illusionistic frescoes of the Renaissance.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

Aged nearly 1,700 years, the world's oldest bottle of wine is probably still drinkable.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

The heads of two giant mythological water horses honor Scotland's horselord past.

This ruined travelers shelter sits abandoned in a desolate bog of Flow Country.

The most northern place on the mainland of Great Britain.

The sign marks one of the endpoints to mainland Britain's longest overland travel route.

Where the sleeping monsters of Scotland's oil industry are left to rust.

This rare surviving broch is one of Scotland's most impressive Bronze Age structures.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

This monument depicts a harrowing event involving an escaped polar bear.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

This brilliant display of whirling fireballs celebrates Hogmanay.

This charming old building's loose connection with the Scottish Reformer is what saved it from demolition after it split apart.

This 16th-century close preserves an unusual piece of Edinburgh's transportation history.

A public art installation with a nautical themed poem, enhances this pedestrian street.

This city square dates back to the Scottish Enlightenment and was home to some of Scotland's brightest minds.

The fountain marks the area where hundreds of accused witches were burned at the stake.