I love old time horror shows. I got into them back in 2005. Lights Out! Escape, CBS Mystery Theater, many more.
There's a Sci-Fi/Horror "Speculative Fiction" show from the 70's I love called Mindwebs.
And BBC Radio has still been doing shows since forever.
There was an old cop reality show like COPS called Nightwatch. Not sure how real it was, but some situations were nutty. It's interesting to listen to, hearing how differently people spoke back then.
Many old radio material is available for free on Youtube and Archive.org.