Modeled after the labyrinth in Chartres Cathedral, this small-town Indiana memorial labyrinth sits half a world away.

An abandoned observatory in the middle of the Illinois prairie.

A steaming, boiling hellscape sources Hokkaido's thermal baths.

More than 300 years old, Kyoto's historic "teahouse" still operates as an invitation-only geisha club.

California's own majestic geyser is powered by a subterranean volcano.

The fossilized remains of ancient California redwoods.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

Nursery with extensive collection of flesh-eating plants operated by the author of "The Savage Garden."

The haunting ruins of Jack London's dream house.

The largest drain hole in the world.

This graffiti-covered bridge is the quintessential vision of a place for disillusioned youth to escape the complexities of burgeoning adulthood.

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

At night, a grove of towering redwood trees growing through the pavement block out all light from the so-called “Dark Park” of Madrone Avenue.

An abandoned, unfinished mansion on grounds strewn with lava rocks.

A popular tourist cave with a dark past.

Before it was abandoned and left to rust alongside the road, this riverboat starred in a John Wayne movie.

This hiking/biking/horse trail along an old railroad grade features trestles, tunnels, and a roadless stretch through the scenic Susan River canyon.

This dry lake bed contains the oldest known petroglyphs in North America.

Home of what was the largest hydraulic mine in the world, producing gold and the first diamonds in the U.S.

A train tunnel that was made obsolete by the dam it helped create.

As fallout from an irrigation project, a formerly cottonwood-lined stream is now a sandy, desolate, post-apocalyptic channel lined with weathered stumps and tumbleweeds.

Its dark depths conceal millions of rare, delicate crystal formations.

Once the largest town in eastern Yuba County now sits abandoned.

The ruins of a military outpost from the 1860s form the centerpiece of a Nevada state park.