The Palace of Knossos is situated on the island of Crete, and is the largest archaeological site from the Bronze Age. Knossos is considered the oldest city in Europe, and it was once ruled by the Minoans. You might know the name -- the Palace site is also considered to be the mythical Minotaur's home. You can still see a fresco of the creature painted on the palace walls.
Walking through, visit the queen's megaron, with its reconstructed fresco of blue dolphins. Also check out the palace courtyard, and the Throne Room. You'll get a real sense of scale and accomplishment from the Minoans and their King Minos, despite having been around 9,000 years ago.