TEAMS (Teaching Association for Medieval Studies) has a terrific compilation site of various web resources, bibliographies, and info on their teaching award for K-12 educators here:
https://teams-medieval.org/?page_id=38
These videos, oriented towards high school students taking courses such as AP World History, were created by Young Adult author John Green. Possible assignments include having students create questions using tools such as Ted Ed, such as this one based on video #11.
Christianity from Judaism to Constantine: Crash Course World History #11
Fall of The Roman Empire...in the 15th Century: Crash Course World History #12
Islam, the Quran, and the Five Pillars All Without a Flamewar: Crash Course World History #13
The Dark Ages...How Dark Were They, Really?: Crash Course World History #14
The Crusades - Pilgrimage or Holy War?: Crash Course World History #15
Mansa Musa and Islam in Africa: Crash Course World History #16