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HeavenGames is a community of forums devoted to older RTS games and city-builders. Much of its content lies in the forums - much of it no longer accessible anywhere else. It has survived since 1998 even as many of its competitors have died out.
Some games include Age of Empires II (aok.heavengames.com), Age of Mythology (aom.heavengames.com), Age of Wonders, and Caesar III. Age of Kings Heaven, in particular, has a widely used downloads section for old maps and recorded games.
Declining, although its longevity is very notable among gaming sites.