I mean every city has "their thing". I know Amarillo is not alone. I moved here back in 1986 and the things I have discovered about this area. Oh my goodness. I still think Amarillo is a great place to live. We just have some weird stuff. Oh and these weird things seem to be absolutely normal to everyone here.
Somewhere out on I-40 you'll find the famed Cadillac Ranch. It is quite the site to see and has changed a lot since it was created in 1974 by Ant Farm. Aliens moved the monument closer to I-40 in 1997.