this isnt what it is (may be) but if the top one pointed up..to the sky. then it could be a rocket launcher site thing. where the flames go down and round the tunnel? maybe?
tilt your head so that the pic is no longer tilted, and then look at the water stains and the lower pipe, its either an onion, or a small fat example of the female genitals
Excellent location and well captured, but I think this shot would be so much better as a landscape crop of the almost bottom-third of the frame. I know what you're trying to do with the top-right but I don't think it brings anything to the shot and, if anything, detracts from the rest of the photo and the main subject, the rider.
I think the pipe fading to black with the rider foreground already fills the frame and has some great leading lines and highlights to capture the eye. The rest is superfluous.
just give it a POD!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! but true, no helmet