Speaking of Jesus Franco, earlier this year the Filmoteca Española made available online a "lost" film of his, Vaya luna de miel, which was never released to the cinemas, and whose whereabouts were unknown for almost 40 years.
The film, a light comedy/adventure, loosely based on Edgar Allan Poe's The Gold-Bug, is a bit of an unusual entry is his filmography, and if it wasn't for Lina Romay prancing around naked (or close to it) it could almost pass as a kids flick.

The film remains available on Vimeo, with English subtitles, and with no planned Blu-Ray release (apparently, there are some rights issues that may prevent one from happening any time soon) it's well worth a look.
You can find it here:
Also, the Filmoteca Española has a PDF with information about the film, its restoration, poster art, and more, here:
https://www.culturaydeporte.gob.es/dam/jcr:4779b6e3-7742-4504-84b3-d33e072054a2/el-dor--en-casa---vaya-luna-de-miel--de-jes-s-franco.pdf