What (potentionally good) obscure game maps exist on the Garry's Mod Workshop?

Both are fine as there are still loads of new players that haven't ever seen Gmod 12 era addons and maps

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I was looking on gamebanana and found gm_superstruct. So I looked on the workshop and someone made an updated version which looks the same called gm_superstruct_v2b. But it means my stubborn friends will actually play it.

I had a go playing it and it's alright but it is does show it's age at 12 years old