Land of the Dead
Directed by George Romero the zombie king himself

Set many years after Day of the Dead, society has returned to life in a new way. The zombies are rotting away into irrelevance & now disregarded much like the way homeless people are today, as the human survivors live in a fortified city, trying to live normal lives. Protecting them is an enormous tank-like vehicle called the Dead Reckoning with the artillery and firepower of a small nation. This story shows what happens when the Dead Reckoning's reasonable leader, Riley, loses control of his command. Riley must try to take back control of this powerful vehicle, while at the same time battling his way through a city filled with zombies...


http://www.imdb.com/title/tt0418819/
http://www.landofthedeadmovie.net