Where is the only US flag flown that is not raised or lowered and is not saluted?

The United States Flag Code establishes advisory rules for display and care of the flag of the United States. It is title 4 of the United States Code: 4 U.S.C. § 1 et seq. These are US Federal law, but there is no penalty for failure to comply with them and they are not widely enforced — indeed, punitive enforcement would conflict with the First Amendment right to freedom of speech, as the U.S. Supreme Court has ruled when the subject has come up in the past. (The Flag Desecration Amendment that has been proposed from time to time would override Supreme Court rulings on the matter, if it were passed.)