1 day, same birth place. I don't want to live before central air and heat, microwave ovens, free porn, and stores that sell nothing but donuts.

I'd go back 800 years, and be a Native American on the plains, before Europeans got there.

Athens, circa 500 BC

I am a big fan of Leonardo Da Vinci, so would love to go back and meet him. I wouldn't stay long though, because of the danger to a pagan back then. I am also fascinated by the Victorian era. It was a time of invention, a time when women were beginning the stirrings of suffrage, advancements in medicine, science and science fiction, writing, dancing, music, mysticism. Besides that, Steam punk is kinda cool.

About 1850, around the time photography was just becoming refined. I'd travel and shoot images I know would become important historical documents in centuries to come. So instead of all these artistic woodcut impressions, there would be real images. And I'd stay longer than 6 months if I was rich enough to be comfortable!

Pre european Australia

the arty & socialist cafehaus society in vienna in 1925 would have suited me for a while. hungarian gypsy violins, women finding their power, painters, workers' unions, yes, i would have liked it.

Paris in the 1920's.

Kensington 1966

As far back as needed to STOP religions of any kind from being invented thus it would release Human Kind from them and allow humanity to develop and evolve as it should have done in the first place.