Knossos: Fresco of the Spectators & the Bull Fresco (Click to ENLARGE):

Knossos fresco of the spectators and bull fresco

It is difficult to imagine frescoes more breathtaking than these at Knossos, regardless of the era in which  we find frescoes.  The Minoans quite simply were supreme masters of the art and artisanship of the fresco.