Once one of the largest producers of pig iron in the world.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

This private residence was the template for one of the most beloved television homes of all time.

San Francisco's newly reopened hands-on science museum.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

The most famous location in China was home to whole dynasties worth of imperial rulers.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

One of the oldest family businesses in Reykjavík serves lamb-based hot dogs.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

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

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

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

The most powerful waterfall in all of Europe.

This elegant arc of a waterfall marks a religious turning point.

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.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

Op-art architecture designed for happiness.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

Museum dedicated to the terror regimes of Hungary.

Housed in an old church, this hunting museum holds a collection of mythical bird-rabbit creatures.

Daily jousts and dancing barrel makers in Munich's mechanical clock.