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.

Few remain of these distinctive old trees that once served as natural landmarks for travelers on the road.

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

A scale model of the world's largest existing lensed telescope.

When this 18th-century observatory's meridian was moved, it set Sweden's time back by 0.04 seconds.

A Japanese video game arcade hides in the back of a Swedish pool hall.

A tombstone on the grounds of the royal castle marks the burial site of a Swedish king's beloved dog.

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

This centuries-old rooster survived a devastating fire.

A plaque marks the house in Stockholm where the French philosopher René Descartes lived up until his death.

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

This giant subway sculpture celebrates the fruit that inspired the theory of gravity.

Sound travels strangely in this underground whispering gallery.