Amongst the periods in time that I want to see most, the period in China between 0AD and 900AD is certainly in the top ten. The age of the Three Kingdoms and all of it's conflict has always fascinated me. Too bad it's so hard to separate myth and legend from fact, but I think that I could stay enthralled without searching for the truest history of the time.
I've got to visit China someday and see whatever's left from this period for myself. What I've read of classical-era China is profoundly inspiring, dreadfully sorrowful, and utterly hilarious.
I'd prefer to 'see' the 1-2,000BC period.