What is the old movie where a serial killer keeps the heads in hatboxes The house burns at the end of the movie?

The movie you're referring to is "The Last House on the Left," directed by Wes Craven. In this 1972 Horror film, a pair of teenage girls are kidnapped and brutalized by a group of criminals, leading to a brutal revenge plot by their parents. The imagery of heads kept in hatboxes is associated with the film's intense themes of violence and retribution. The house burning at the end symbolizes the destruction of evil and the cycle of violence.