Learn Spanish (Latin America): Le emociona que nosotros visitemos la ciudad. - It excites him that we are visiting the city.

Verbs that express emotions or feelings, like emocionar (to excite), trigger the subjunctive in the second part of the sentence when the subject changes. Because the first part is about his feelings (le emociona) and the second part is about our actions (nosotros visitemos), the subjunctive is required.

Why does the sentence start with Le emociona instead of Él emociona?

Emocionar works just like the verb gustar. Literally, the sentence is structured as 'That we visit the city excites him.' The action (us visiting) is what causes the excitement, and the person feeling the emotion is the indirect object. That is why we use the indirect object pronoun le (to him) instead of the subject pronoun él (he).

The English translation says 'we are visiting'. Does visitemos specifically mean an ongoing action?

Not exactly. The Spanish present subjunctive doesn't have a direct equivalent in English, so visitemos covers both 'we visit' and 'we are visiting'. English often uses the present continuous ('we are visiting') or an infinitive ('for us to visit') to sound natural after expressing an emotion, but Spanish simply uses the standard present subjunctive.

Is the word nosotros absolutely necessary in this sentence?