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

This innocuous-looking button may have been used to assassinate a king.

The giant club-wielding wildman stands proud as the symbol of Swedish Lapland.

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

This small statue hints at the incorrect origins of the lush landscape park surrounding it.

The composer known as the "Swedish Mozart" arranged to be buried in an unusual spot.

The northernmost point in Denmark is a turbulent sandbar created by two clashing seas.

Enormous ants wielding giant pine needles guard a Stockholm real estate company's office.

Where Venice's gondolas go for a tune-up.

Pilgrimage site for star-crossed lovers.

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

It was meant to help transport wounded soldiers to a secret underground hospital.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.

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

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

Cold war icon and onetime "hole" in the iron curtain.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

One of the world's heaviest musical instruments towers within a popular urban park.

Metro station with a claim to rock n' roll fame.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

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

Locals rallied to save this beloved mural after someone mistakenly attempted to cover it.