Articles: - This site - https://sadlunchbreak.com/
Quizzes: - Sporcle: https://www.sporcle.com/ - Geoguessr: https://www.geoguessr.com/ (1 quiz per day if you're on the free tier)
Wikis and rabbit holes: - Wikipedia: https://en.wikipedia.org/wiki/Main_Page - TVTropes: https://tvtropes.org/
YouTube: - Search "documentary, long" in the searchbar and see what turns up. The "long" part will find videos that are longer than 20 minutes.