Two volcanic lakes in an enormous crater formed in a prehistoric eruption.

A formerly glacier-tipped volcano that inspired none other than Jules Verne.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

This hobbit-y little hot spring may be the oldest spring used by humans in all of Iceland.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

Climb right into the heart of this colorful Iceland volcano.

One of the most remarkable caves in all of Iceland was created by a once raging river of lava.

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

Walk in the footsteps of the gods and straddle two tectonic plates.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

Catalonia Tradition: Beating the hollow Christmas log until it defecates in your fireplace.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

These jeweled relics have a scandalous and contested past.

These blingy, baubled skeletons lie in glass boxes inside a baroque Bavarian church.

The patron saint of spinsters grasps a container of dried blood.

In a small churchyard in Dingolfing, Germany the quaint Schusterkapelle is there to remind you of your imminent mortality.

This small town in Germany was once a center of peppermint production, and has the museum to prove it.

A graveyard and memorial chapel for victims of leprosy.

The final resting place of many of Germany's most famous communists.

A rare example of a German cemetery with traditional grave markers dating back several generations.

This cemetery features modernist statues as strange as its name.

A beautiful but toxic fountain of mercury.