It should come as no surprise that the godfather of zombie films would have one of his “lost” films come back from the dead. We find out from Bloody Disgusting that a “lost” Romero film from 1973, 
“Amusement Park”, has been “found” and hopefully will see the light of day soon. This evidently isn’t a zombie flick, but those that have seen it say it is still very scary and disturbing. I hope to be able to validate that myself someday, especially since its setting is, one would imagine, an amusement park! You can help by donating to the George A Romero Foundation here.
Featured image from the George A Romero Foundation website.