Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

This mountain fissure hides a secret path to a secluded mossy grotto within the rock itself.

This black church sits alone among a field of lava rock.

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

This stunning concert hall has become a symbol of Iceland's national recovery.

A bit of the Berlin Wall was gifted to the Icelandic capital to commemorate the 25th anniversary of German reunification.

Learn about Iceland's hidden folk at this school dedicated to the study of elves.

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

Iceland: home to volcanoes, waterfalls and, apparently, Santa?

Three million year old fossils are exposed for all to see on this Icelandic shore.

The oldest church in Iceland is one of the few to feature ornate decoration.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

Hidden beneath the streets of London is a secret subway that only carried mail.

Eighty million natural history specimens call this gargantuan museum home.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

Hans Christian Andersen for the postmodern world.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

The remains of a medieval wall discovered in the basement of a jewelry store.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

Climb inside an iron crystal magnified 165 billion times its normal size.

An ancient Egyptian temple in the middle of Madrid, Spain.