The 6 flags over Texas, hanging in the Alamo.
L-R it's Spain, France, United States, Texas, Confederate and Mexico. Why they're not in chronological order (France, Spain, Mexico, Texas, United States, Confederate) is beyond me.
The Texas one is my lock screen, my home screen has been whatever William Byron's most recent win was for a while, changed it depending on his win, but I got an aesthetic screenshot in Smash tonight: