The terraces at Mammoth are actually split into two general areas: the Lower Terraces are where most of the geothermal features are, including the Main Terrace, Palette Spring, and Minerva Terrace; the Upper Terraces contain a variety of other features, not quite as interesting as the lower (IMO) but also worth exploring.

This is a shot of a huge travertine mound at the Upper Terraces; the trunks of dead trees making it seem quite stark indeed.