Anyone know about old football grounds?

Online lately, I've been seeing a lot of discussions about the preservation of historical buildings, and it somehow led me down a rabbit hole of researching old football grounds. It's fascinating how many of these venues have stories stretching back over a century, witnessing so many pivotal moments in sports history. I'm especially interested in those that have maintained some of their original charm or have architectural features that are quite unique. Does anyone here have a particular favorite old football ground or perhaps know of some hidden gems that are still in use today?