The mood of an idea conveys the attitude towards a situation or concept. In the case of the indicative mood, it carries an opinion or a fact, something that is considered as a general truth in a specific context or region. In the sentence provided, the insistance on exalting the beauty of the city is in the indicative mood. It is not an imperative for it is not an order. Neither is it subjunctive for it is not an imaginary situation.
