Bad Feel: The silent film classic Metropolis was taken out of the US Public Domain via the Uruguay Round Treaty; which was ultimately ruled by the courts to be an okay thing to do; and it doesn’t go back into the PD until 2022.
Good Feel: The original novel from 1925 went into the public domain just now, so you can still totally adapt that!
Weird Feel: The famous robot’s design was wildly different in the book tho, less of an art-deco gynoid and more described as akin to a Terminator-type skeleton in a transparent “skin,” a bit like a Henshin Cyborg or Crystal Bowie from Space Adventure Cobra, if you’re familiar with either of those exceedingly obscure points of reference…