I’ve just finished watching The Great Courses’ “Experiencing Medieval Europe”. I really enjoyed it and think many other travelers would, too. There are 24 episodes covering the cities listed below, all of which fill two episodes (just over 30 minutes each) except as noted:
Introduction (one episode)
Rothenburg ob der Tauber (Germany; one episode)
Prague (Czech Republic)
The photos/videos of each covered building were sufficient for me to decide whether I’d find them visually interesting, and I believe the historical background offered would do the same for more history-focused travelers. The instructor’s delivery was engaging. My one nitpick was that not all the sights were labeled on the screen, so I’m going to have to do some digging in guidebooks or on the internet to figure out the correct spelling in order to identify some of them accurately in my notes.
I streamed the course by using my library’s Kanopy account. Kanopy was discussed in this earlier forum thread: https://community.ricksteves.com/travel-forum/books-movies/kanopy-streaming-service. The Great Courses can also be purchased individually from the company itself (https://www.thegreatcourses.com). Alternatively (and I think more cheaply), one can stream them through The Great Courses Plus via a membership or subscribe to the company's offerings through Amazon Prime (and possibly other pathways?). It appears there’s a one-week free trial now being offered through Amazon Prime.
I’ve also watched two of the company’s other specifically travel-related courses and found them worthwhile: “The Great Tours: England, Scotland and Wales” and “The Great Tours: Greece and Turkey, Athens to Istanbul”. The British course has 36 episodes and takes a variety of approaches: by historical era, by geographical area and by topic.