I remember coming across a wire back in 2005 that I couldn’t figure out at first. Turned out it was an abandoned telegraph wire. Probably been taken down by now.
I've seen them along railroad rights-of-way. Old telephone poles leaning this way and that, glass insulators on top the color of Coke bottles or maybe some shade of blue, copper wire turned green by years and exposure to the elements wrapped around them, the wires sometimes connecting poles, sometimes snapped and lying slack in the weeds like green spaghetti.