Life Retreats. An artistic representation of the fall of Philadelphia by artist FC Reynolds. From a gallery of Zombie War in the American Survivor Museum.
(Actually from this gallery: https://www.deviantart.com/jamesdesign1)
Artist's rendering of a helicarrier, a massive vehicle that could be used in anti-zombie warfare and act as flying refugee camp far from reach of the Zeds. The futuristic design is expected to cost $100 billion dollars and may not even enter production due to its complicated design.