SERIES PREMIERE: Here’s a new approach for a travel series. Host Brian Unger, whom you may remember from his stint on The Daily Show, takes viewers on a tour of a different location each week. So what’s new about that? Well, in this series, Unger isn’t as interested in what he finds there as in what used to be there – and thanks to computer-generated graphics and special effects, the cities and scenery of today give way to the way things were yesterday. And long before that…