Sweden's oldest street has not changed for nearly a millennium.

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

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

Walking through this narrow gorge will make you feel like you've fallen into a fairytale landscape.

Frequent fliers welcome in this airplane hotel.

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

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

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

The remains of Alfred Nobel's first nitroglycerine factory can still be found on the shores of a Swedish bay.

Stockholm's deepest subway station is also a stunning ecological wonder.

It houses the remains of a 17th-century version of the Titanic.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

Nine bronze hands protruding from a wall honor the student uprising that led to the fall of Czechoslovakia's Communist government.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

The hidden lair of an alchemist rediscovered in a 2002 flood.

Countless grotesque faces stare out from this eerie Prague art wall.

Macabre astrological automaton clock dating to the late 1400s.

Canada's subterranean Cold War museum has doubled as a movie set.

This colorful creation wasn't always a welcome part of Toronto's Moccasin Trail Park.

This natural sea cave hides a small wonderland of natural turquoise beauty.