Where in Time is Carmen Sandiego?

Screenshots:

Background:
Carmen Sandiego, who heads the Villains International League of Evil, is using a time machine to steal the most valuable treasure from history. You must travel back through time and solve hundreds of cases to ultimately stop her from getting away with it. There are 7 difficulty levels in this game, which should be enough to satisfy most gamer's abilities, and you also get to learn about the cultural backgrounds of each place you visit. Who said games aren't educational??