Dear Teachers,

1. I'm going to go visit my friend at the Ministry of Foreign Affairs / at the Department of Foreign Office next week.

- Is this natural to say?

Thanks very much to Teachers,

>Department of Foreign Office

Foreign Office (UK)
State Department (US)

Can't have both.
Sounds fine Stevenukd. I would suggest placing "next week" at the beginning of the sentence to bring it closer to the verb "to go." Does that sound better to your ear?

Have a happy new year!
 Marius Hancu's reply was promoted to an answer.