It's likely one most of us here have never gotten a chance to hear - KTSA San Antonio, Texas. Like many longtime radio pioneers, this one had a storied Top 40 history back in the 60s and 70s before morphing into the talk format it uses today. It officially signed on May 9, 1922.

Every station that chooses to mark the milestone has a different way of doing it. In this case, KTSA has created a 6-minute video that's more like a San Antonio city tour guide than a radio station's anniversary. There are no airchecks in it, which is a puzzling disappointment. Still, if you're curious, you can watch it below.