Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

Prone to disastrous fires, the city of San Francisco has the Guardian, a fireboat gifted by residents, to watch over them from the bay.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A psychedelic labyrinth on the San Francisco bay.

A huge musical instrument played by the ocean.

A rough granite monument marks the spot where Europeans first caught sight of the San Francisco Bay.

Another of California's unused Cold War missile defense complexes has become a graffiti gallery.

Stuck in the arcade of Casa Isolani are three arrows of mysterious origins.

One of the highest mountain passes in Europe has been ranked among the best driving roads in the world.

Centuries ago, red and white wine poured from the statue's breasts whenever a new Venetian ruler was elected.

This Italian foot path winds through the mountains via 52 individual tunnels.

A map of Italy made entirely of trees.

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

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

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

Europe's second largest ossuary wasn't discovered until 2001.

This hanging crocodile is thought to be the "dragon" that once plagued a Czech city.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

A masterpiece of modern architecture that caused quite a stir in Paris, recreated in Bologna half a century later.

Gods clash with machines in a power plant regenerated as a museum.