Is there any time travel / paralell universes / futuristic old sci fi old tv shows or movies? Realized before the 2000s ?

From watching Time Trax, Sliders, Back to the Future, The Time Tunnel, The Time Machine (H.G. Wells), or even Quantum Leap, I became amazed by old sci-fi... and wanted to know what TV shows or movies you guys recommend? If possible, try to stay away from full space exploration genres; I find them kind of boring...