This natural sea arch highlights Ireland's rugged coastal beauty.

A 1930s-style speakeasy with a secret doorway and one-of-a-kind cocktails.

The Dublin sea wall draws walkers, photographers, and fishing enthusiasts.

Honoring the Guinness brewer whose quest for the perfect pint led to the creation of the t-test, a cornerstone of modern statistics.

A modernist landscape of water and sci-fi concrete.

The man who wasn't there.

It took years to decode its mysterious messages.

At night, this glittering musical tunnel draws skaters and photographers.

A humble garage, world-famous for being the epicenter of a technology revolution.

This redwood is a historic landmark, a town’s namesake, and the dancing sideline symbol of Stanford University.

A trail weaves through the verses of a poem illustrated by stone sculptures inspired by Native American pictographs.

In 1998, Larry Page and Sergey Brin briefly ran their fledgling company from this Silicon Valley garage.

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

The model behind the iconic 3D test model.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Venice's island of the dead.

As can be expected from a centuries-old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

Two stone columns flank the grand Venice square, but there were supposed to be three.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Still standing despite its considerable slant, this tilted lighthouse has become a local symbol of resilience.

One of the world's most complex timepieces.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

One of the last doorless, continuously moving elevators still in use in the U.K.

This Sheffield sculpture composed of 17,000 Allen keys honors both urban falcons and a furniture icon.