Care to join me?

Picking my way through a massive warehouse full of antiques, I spotted this trunk all the way in the very back, way up high on a shelf. It was clearly quite different from the others. I called upon my high school french to translate the mysterious message...

"The Cosmic Trunk
The trunk to travel in time"

Perfect! Just the kind of trunk I need.
I am heading first to Italy during the Renaissance. Hopefully I will pop out and be mistaken for a Medici daughter...
Where (and when) would you go to????