What's the Polis?

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Across
  1. 4. A city centered around high-tech industry.
  2. 5. Translated as "city of the dead," it refers to a large cemetery or graveyard.
  3. 6. this city along with Saint Paul, and the surrounding area are collectively known as the Twin Cities
  4. 7. an internationally important city inhabited by many different peoples reflecting a great variety of cultures, attitudes, etc.
Down
  1. 1. the chief, and sometimes capital, city of a country, state, or region
  2. 2. refined, cultured, or elegant
  3. 3. advocating or characterized by the exclusive possession or control of something