A word that could be used to represent a city (e.g. New York), or a building (e.g. the US Capitol), or even a sacred site of some sort (e.g. Mauna Kea).
Preferably a noun, but a single adjective could work too.
"Influencer" and "sanctum" were the closest ones I've found, but they don't seem to contextually fit well enough to convey such a meaning on their own, if that makes sense.
If it helps, I'd be using the word to represent a card type in politically themed board game. So, the ultimate goal of the word is to assist in teaching game's mechanisms.