I have to give a shout-out to
Broken Window Theory. Their videos are, in my opinion, the very antithesis of the annoying, clickbaity channels that unfortunately seem to dominate the hobby. The cinematography is fabulous, very professionally produced and edited, with excellent soundtracks and thoughtful, respectful narration that focuses on the history of each location and the features that make them attractive to explore. And being located in Germany, they really do a great job of showing off fantastic locations that may be unfamiliar to us American explorers, sometimes in shockingly good states of preservation and natural decay. And, they actively post here, over on the Photo board. The Proper People is the only other channel that I've found that even comes close to being as good as what these guys do, but BWT is definitely my favorite by far.