If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

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

Petrified footprints of one of the very first vertebrates to walk on land.

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

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

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

When this funny little building went up in the 19th century, most people thought it would simply fall over.

This real life asylum of horrors is now an abandoned ruin that hides the unbreakable code to one patient's insanity.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

The remains of an ancient Roman city are hidden underneath Bologna's beautiful public library.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

This massive blockhead sculpture hides an entire library.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

A bit of retro transportation flair preserved in the world's largest department store.

An artist's cute bronze subway sculptures belie his violent artistic past.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

The oldest surviving synagogue in New York City is now a soaring art space.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

A semi-scholarly approach to sex.

Elevated freight railway turned wildly successful urban park.

This whimsical fountain pays tribute to Toronto's four-legged friends.