Fern and Feverish

We walked down to the railroad bridge this morning so Eric could show me these old concrete pillars or abutments all covered in ferns and graffiti. Years ago we often walked near here, but never saw this before; maybe some trees have been removed, we can't figure it out.
I also can't figure out why I felt fine yesterday, but today have felt punky with all the symptoms of the flu. I reckon it's because of that covid shot. Took a couple of nice, long naps.