Rurouni Kenshin

One of the best anime series ever made, recommended for people of every taste and age. It has everything, an intriguing "real world" historical setting, great characters, comedy, drama, (mild) romance, revenge, obsession, and Harmless Looking Villains. If you're an animation fan and you haven't tried Kenshin yet, rent or buy a disc now, you won't regret it!