BBC Radio Dramatization  - first book of the trilogy "Lord of the Rings" written by JRR Tolkien  - "The Fellowship of the Ring"

The 26-part series was subsequently edited into 13 hour-long episodes, restoring some dialogue originally cut for timing (since each hour-long episode is actually around 57 minutes, as opposed to 54 minutes for two half-hour episodes), rearranging some scenes for dramatic impact and adding linking narration and music cues.

Daphne du Maurier's Rebecca Radio DramatizationRadio Dramatization of Du Maurier's classic novel.

With Lawrence Olivier as Maxim and Vivien Leigh as the 2nd. Mrs. De Winter. The first 45 seconds of the recording are not very good, but after that it is very good.

Agatha Christie's The Case of the careless victim radio dramatizationThis story was written by Agatha Christie for the radio dramatization debut of her famous detective Hercule Poirot. Very Good Quality. Recorded introduction by the author herself

Radio dramatization of Nightfall

Isaac Asimov's classic short story

This is the dramatization of Asimov's orginal 1941 short story, broadcasted in 1950 (very good quality). It is about  a world called Kalgash that doesn't know what a night is due to it's six suns. But darkness is coming and fear is the companion that may prevent the planet's civilization from seeing the stars for the first time.
The story was turned into a novel by Robert Silverberg in 1990 with Asimov's blessings and assistance but no dramatization has been made of it, as far as I know.