A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

This little sun pays homage to a massive gate that once stood at this location.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

This Bordeaux parking garage has 712 indoor spaces, and one outdoor.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

From the Difference Engine to the Cray-1, all under one roof.

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

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

Medicinal spa created with the discharge from a geothermal energy plant.

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

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

A library and museum dedicated to typography.

The only theatre in the world constructed specifically for sound movement.

A modern mechanical planetary system, part of a 10,000 year clock.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Golden Gate Park's historic collection of plants.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The land is home to swimming ponies and a legendary 18th-century treasure.

A huge musical instrument played by the ocean.