People have been living in the cave houses on this Italian hillside since the Neolithic era.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

Surrounded by ash fields in Iceland, an impossibly verdant valley looks like something out of a fairytale.

The oldest steel ship in Iceland has been beached for years and is now a rusting ruin.

Puffin enthusiasts flock to Europe's largest seabird cliff, which over one million birds call home.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

The Swedish flag over this small naval fort signals that the nation is at peace.

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

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

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

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

A 130-year-old urinal is the oldest of Stockholm and perhaps all of Sweden.

Stockholm's tiniest statue is of a small boy looking at the Moon.

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.

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

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

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

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

A little sculpture with a large wardrobe.

A shining memorial to a Belgian hero is said to bring luck to anyone who touches it.

The Devil’s own choice when he needs a drink in Brussels.

Brussels' favorite peeing boy has a sister.

This non-profit theatre in the heart of Brussels is dedicated to hosting independent films.

A huge old mansion full of thousands of toys, each there to be used and played with.