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.

This controversial depiction of the "Founder of California" looks as though it was sculpted from mashed potatoes.

Nuclear waste dump site now an environmental sanctuary.

A poignant memorial to a young boy whose death spurred a dramatic increase in organ donations in Italy—dubbed the "Nicholas Effect."

The mysterious round rocks of Schooner Gulch.

Bonsai trees that are up to a thousand years old.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

Stroll through a wonderland of stupendous moss-covered trees.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

The wreckage of a deadly bomber plane crash can still be found near an Arizona peak.

In the depths of the Everglades, one man has dedicated his life to studying the elusive Skunk Ape.

Steep canyon walls hide a forested oasis in the West Texas desert.

This crumbling stump is all that remains of what was once thought to be the oldest living organism.

This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

A memorial to the unknown and unheralded men and women of the Cold War military and intelligence services.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

This rare wildlife haven in Singapore feels like you're in the tropical rainforest.

A thriving Black community was destroyed by an angry white mob at this site in 1923.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

The site of the little-known Pennsylvania battle that sparked the Seven Years' War.

A former Nazi lookout tower with a magnificent view of the Rhineland.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.