The world's first purpose-built motor racetrack was destroyed by the outbreak of two world wars.

A medieval replica of King Arthur's legendary table, the Round Table hanging in Winchester Castle was decorated by Henry VIII.

Gothic tower where Lord Alfred Tennyson wrote the poem "The Sleeping Beauty."

This public pool is one of the last remaining lidos of the countless built in the 1930's as public works projects in the United Kingdom.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

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

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

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

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

The magic's in the hole!

The oldest apple tree in the Pacific Northwest.

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

Each summer, the migratory bats living beneath the bypass form "batnadoes" at dusk.

Rising out of miles of farmland, these buttes are sometimes called the world's smallest mountain range.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

One of few lasting examples of the brief octagon craze that developed into folly.

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

An artsy hidden staircase leads to breathtaking views of San Francisco.

This mountaintop beacon is only lit three times a year but shines like some kind of all-seeing eye.

Thousands of crosses and markers for soldiers who lost their lives in Iraq and Afghanistan blanket a California hillside.

Art in the form of a winding, man made crack in stone.

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

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