I love those movies. My favourite is The Time Machine from 1960, based on H.G. Wells novel. It's wonderfully camp and the mix between great scenery and silly costumes is great. It's also very faithful to the original novel.

Yup, that one is great. As a kid I loved "Time Tunnel" which was a late 1960's TV format which was aired in Germany in the mid 1970s. No idea if this can still be streamed though.

Back to the future. All three.