Get up close and personal at this Fresnel Lens.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

The world's largest fully steerable radio telescope.

This rural community has attracted both scientists and techno-refugees due to its federally-mandated lack of technology.

Inspired by a foil-wrapped potato, (seriously) the Markel Building has been deemed one of the 10 ugliest buildings in the world.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

The maritime museum that boasts the largest nautical library in the western hemisphere.

One of the world’s largest living advertisements is made out of pine trees.

This erect, phallic geological spire wasn't always named so domestically.

Moonbows over Kentucky.

The world's longest known cave system.

A curiosity-seeker's paradise set inside a three-story historic school house.

This sky-high radio mast is formerly the tallest man-made structure in the world.

A rare wayfinding portmanteau of “Street” and “Avenue.”

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

This old selenite mine is dotted with tiny crystals that make it shimmer like it's covered in glitter.

Giant telescope mirrors built in a spinning furnace under a college football stadium.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

Concrete crosses scattered across the Arizona scrubland which were used to align spy satellites.

The remains of this hell for leather wild west town can still be found in the Arizona desert.

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

A natural history wunderkammer in the middle of the desert.

The fading, forgotten remains of a once bright and booming factory.

An artificial crater field that trained astronauts for lunar exploration.