The watery grave of an impractical idea.

This rare vessel mixed luxury with labor before being converted to a museum and sometimes haunted maze.

A treehouse assailed by the elements and the government, now gone.

Direct, creative challenge to Mother Nature's winter wrath.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

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

A giant white horse drawn on an English hillside may not have been intended to be a horse at all.

A museum wholly devoted to juvenescence.

This one has sailed five times as far as Sir Francis Drake's famous ship.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

Famously misunderstood wonder of the ancient world

A Looff creation in Santa Monica best described as “a California-Byzantine-Moorish-style fantasy.”

Everything you always wanted to know about borates is here.

A chain of bells connect the California Missions and honor the legend of the "King’s Highway."

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

A massive volcanic plug is now a protected area that hosts a number of bird species.

Where the writer penned his famous story about a jumping frog.

A second generation sun-powered marvel lights up the night.

This whimsical seashell-shaped place of worship was designed to blend into its surroundings.

This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

A local dialect born in the late 19th century is only spoken in this isolated California valley.

A remote crossroads honoring a fallen talent.

The oldest lighthouse on America's west coast no longer needs keepers, yet they maintain the site anyhow.