Black Bart
Ancient Mariner
Let It Be was the last album to be released but it was recorded before their true swan song, Abbey Road.The beatles - let it be
In Through the Outdoor is indeed Led Zeppelin's last album, Coda being a compilation of leftovers (the same way Endless River is to Pink Floyd's discography) and Page&Plant is not Led Zeppelin.Also, Let it Be and In through the Outdoor have no place here.
Although it is as sad as Gamma Ray's probable drying up of studio output for a good while (maybe not for good), I won't be surprised if Music from Another Dimension (which has great songs on it, though there are a few fillers too) were Aerosmith's last album.