The Petrified Forest National Park in northern Arizona mashes up two areas about midway along the road through it: a petrified forest (natch), and multicolored grounds called the painted desert. It looks like a race of giants tossed these petrified trees out the car window as they drove by about 225 million years ago and the ground, in a number of stratified colors (white and blue mostly at this point) became littered with it all (2015).
Inside a tree (2009). The wiki notes that theft is a problem. Go figure.