This improbable contraption was passed down through five generations of industrious Tennesseans.

One of the Cemestos prefab homes built to secretly house thousands of Manhattan Project workers.

Follow the steps, and this roadside artwork will teach you how to dance.

This park contains one of the largest concentrations of cedar glades, a unique and rare ecosystem.

This historic train station has been converted to a locomotive themed hotel.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

A library where thousands of books explain how to avoid another Great Recession.

This institution celebrates the happy accidents of uncommon sticktoitiveness.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

Many of the murals covering this sleepy Florida town hide some sort of intentional error.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

A Victorian garden in a harsh climate at the border of the prairies and foothills of the Canadian Rockies.

Elevated freight railway turned wildly successful urban park.

Bouncing, delightful, mechanical art at the MIT Museum.

Plans for this peninsula included houses, the United Nations Headquarters, and a nuclear power plant. When none of them worked out, it became an expansive park.

This mysterious and creepy location instills a strong sense of foreboding in all visitors.

This graveyard is the eternal home of the residents of a vanished California town.

This beautiful ridge-top trail is dotted by tiny homes apparently built by a group of itinerant fairies.

The extensive collection of an amateur naturalist.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

A small oasis not far from downtown Moab.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

It's safe—and permitted—to walk across these twin natural sandstone arches.

The tallest bridge in California was constructed for a project that was eventually cancelled.