I rise from desert sands, Older than most lands. Wide at my feet, Pointed at the sky. Built for kings who never die. What am I?

Round, brown, hard-shelled seed, A squirrel's autumn treasure, Sweet treat in the shell.

I sit on a knight, but I’m not a hat, I flutter and shine what do you think of that? I’m the top of a wave when it’s tall and white, I curl and I crash with a foamy bite.

This thing is popular for references to one way bathtub trips to family members. You’re toast!

Standing tall where paths begin, To let the light or stranger in. A silent trade within the frame: When I close, a window opens.