Smithsonian YouTube Channel: https://www.youtube.com/channel/UCWqPRUsJlZaDp-PVbqEch9g. There are over 2,300 videos on this channel. The videos cover a wide range of topics. They have a paid channel, https://www.youtube.com/watch?v=azcqFQUywPQ – looks to be $4.99/month, U. S. subscribers only.
Here are some examples:
A Chinese Grandmother Crosses a River by Zipline: https://www.youtube.com/watch?v=xobhMR3IpeQ (about 3:00 minutes).
These WWI Ambulance Trains Could Care for 500 Men at Once: https://www.youtube.com/watch?v=1UM3N-f1BSU (about 2:00 minutes).
How an Earthquake, Tsunami, and Firestorm All Hit Lisbon at Once: https://www.youtube.com/watch?v=FGhv6zcBPxQ (about 2:05 minutes long).
Titanoboa: Monster Snake – Titanoboa Vs. T-Rex: https://www.youtube.com/watch?v=gVMCuZZ3XKk (about 1:33 minutes long).
Ancient Engineering That Kept One of the Driest Cities Wet: https://www.youtube.com/watch?v=2cU0H58eG2A (about 3:22 minutes long).
Plenty of playlists to choose from: https://www.youtube.com/user/smithsonianchannel/playlists.
Ups Downs Family History 