This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

The universally beloved children's television figure is interred on a high hilltop in one of western Pennsylvania's oldest cemeteries.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

This free, take-a-book shop seems like a trick but isn't.

Bizarre Cavern.

The Grand Ole Opry's big voice came from a small home in rural Virginia where she was eventually buried.

With well over 130 falls and cascades to brag about, Hamilton, Ontario has earned its stripes as the waterfall capital of the world.

Towering basalt columns, a creation of fire and ice.

A giant Troll lurks under one of Seattle's oldest bridges.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

America's most famous piece of self-built architecture.

A layered tribute to the work of mosaicist Isaiah Zagar.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

A walk through the historic city center, under the streets of Seattle.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

A trash dump made beautiful by nature's power.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

An enormous, inside-out glass globe built in 1935.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.