Good eye, Dunsparce. This is Beta Cave 4:
I didn’t include it at because it looked too perfect to be a beta map. I have such a bad memory that I don’t remember seeing it in regular gameplay: therefore I assume it isn’t beta. Correct me if I’m wrong, though. And also, this thread is pretty cool, but that’s because Pokémon Gold’s programming is so detailed. Also, the many ideas from the commentators in this thread help a lot.
Crystal Clair: interesting guess as to the “Strange Map 1.” A word of caution, though: Goldmap is notoriously inaccurate (without the programming changes I have made), and it would not be wise to rely solely on its information. I have checked the programming area around “Strange Map 1” and found that the Beta Goldenrod map is right below it. This leads me to believe that it was a Johto map, and not from Kanto. Also, the cave at the top of the map would make it unlikely to be Viridian Forest. The most likely place it is, and others would agree, is a beta version of Route 28, a.k.a. Mt. Silver. And yes, Route 28 is in Johto, even though it isn’t on the Johto map. Just a reminder, this is all speculation, and by no means do I know where every bit of Pokémon Gold programming goes.
Also, another beta cave, but not a very special one:
Beta Cave 5
It is difficult to tell where it was intended to go. Suggestions?
