I can't speak to YouTube history channels as I've avoided YouTube due to the difficulty of separating the quality content from the sensationalist or politically-motivated content. PhroX's list seems to pass the initial sniff test (perhaps literally for "Tasting History"), but I'd be curious if others can also vouch for it (I'm a "once three people recommend it separately, I'm a lot more likely to check something out" person).
But if you don't mind audio-only, my go-to history podcast for the road is
Hardcore History. The podcaster, Dan Carlin, spends months researching the subjects of each podcast (most of which are closer to audiobook length). He's very good about providing the sources for his work, including direct quotations, and mentioning when the sources may be more biased than would be expected. He used to do a politics podcast as well, but quit it after he got tired of each side (right/left) accusing him of being a partisan of the other side. And before podcasting, he was on the radio, so his delivery is excellent.
I've also listened to and recommend
Norman Centuries, by Lars Brownworth, if that time period in history appeals to you.
I'm currently listening to the
British History Podcast in chronological order. I'm in the 400s AD, and so far the research seems to be well-done.
And of course Mike Duncan is one of the classic history podcast choices, although I've only listened to part of his History of Rome series so far.
For geopolitics? If you live in the U.S., my recommendation would be to turn the radio dial to whichever channel carries NPR. They do a pretty good job of presenting the facts, rather than opinions, coupled with in-depth journalism and interviews of people who have expertise in various fields. It's much more in-depth than what you'd find on TV, doesn't try to push a political view, and when they do interview public figures, they disclose what their position is, so you'll know if they're associated with a particular cause or party.