I don't know what it is: giant pillars, two rows of them, march along. They support two-foot-wide tracks up top, like for an aqueduct, or some other transport system of some sort.



You can see the trees reclaiming the space around the structure. Here a tall-growing juniper makes lace against the face of a pillar.



Rabbits and squirrels live here now.

How tall it is.... Here you can see the parallel tracks, high above.



...and yet, it starts out at ground level. Then, the ground falls away, so that the final pillars are holding up the tracks fifty or so feet in the air.

Because it does start out at ground level, you can walk along those cement tracks. It feels innocent at first--there is the ground, a mere foot below you. Two feet. Three... and the path is wide; no threat of falling, unless, looking down, thinking of your height, you become dizzy; no threat unless your imagination tells you what falling will be like.

Here's the view from up top.



ETA: July 3, 2018. It has now all been torn down. Sic transit, etc.