Tri-State Spook Light aka Hornet Spook Light
One of the few consistently performing mystery lights in the US, going since at least the 1880s, and named the Hornet Spook Light (after a now defunct town). Investigated without satisfaction by US Army Corps of Engineers in 1946.
The mysterious glowing orbs are conveniently visible at night -- when they choose to appear -- along a four mile stretch of the gravel Oklahoma East 50 Road, also called the "The Devil's Promenade" and "Spook Light Road." Current explanations blame it on lights distorted through the woods from nearby highways, or on piezoelectric energy created by quartz crystals rubbing together underground. Or ghosts.
At one point in its history there was a local general store maintaining a Spook Light Museum, but that has been closed for decades.