My friends over at Pro Sound Effects have just released an insane BBC sound effects library. Imagine the BBC doing show after show, year after year in a ton of different locations and covering millions of topics. Now catagorise them, update the metadata, then package them into a 1TB hard drive and voilà! For example, a bunch of the nature sounds come from and where used in the BBC Planet Earth Series. The historical archive sounds capture “pivotal moments in sonic history and sound effects from all over the world”.
If this kind of stuff interests you, then go check out the BBC Sound Effects Library.