Martensgrav is the town founded by Zack and Cody's ancestors. It is located in Sweden. Its only appearance is in "The Swede Life".
The town was founded by Zack and Cody's ancestors Knuut and Olaf during the Viking-age. Though Knuut and Olaf founded the town, they were banished from it for supposedly letting the towns food supplies be stolen by a bear. They were cast on a ship to fall off of the edge of the earth. Years later, Zack and Cody go on a mission to discover the truth about what happened that day. It turns out that the mayor's ancestor tricked the town in order to get Knuut and Olaf banished, and the mayor's family has been living off of the "goodwill" for centuries. Zack and Cody change history and clear their family's name.