THE PLT OF AN EXPERIMENTAL ACFT DEPARTED ZZZ FOR A 20 MINUTE VFR FLT.

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ON 09/SAT/01; AFTER HEARING ON THE TELEVISION THAT MOST ARPTS HAD REOPENED AND GENERAL AVIATION HAD RESUMED FLYING; I DECIDED TO TRY TO RELIEVE SOME OF MY DEPRESSION; CAUSED BY THE TWIN TOWERS DISASTER; BY TAKING A SHORT FLT TO LUNCH AT A NEARBY ARPT. IT WAS A BEAUTIFUL CLOUDLESS DAY; SO UNAWARE THAT ONLY IFR FLTS WERE PERMITTED BY THE FAA; I TOOK OFF VFR FROM ZZZ ARPT AT ABOUT XA10 AM IN MY GLASAIR. I FLEW NE; AVOIDING ZZZ1 AIRSPACE; AND LANDED AT ZZZ2 ARPT AT ABOUT XA30 AM. AS I WAS ORDERING MY MEAL AT THE ARPT RESTAURANT I WAS INFORMED THAT I HAD A TELEPHONE CALL IN THE ARPT OFFICE. MR X OF THE LOCAL FAA OFFICE INFORMED ME THAT I HAD ILLEGALLY FLOWN TO THE ZZZ2 ARPT; BECAUSE ONLY IFR FLTS WERE PERMITTED DUE TO NATIONAL SECURITY. HE INSTRUCTED ME TO PARK MY AIRPLANE AT ZZZ2 ARPT AND NOT TO RETURN TO MY HOME ARPT ZZZ. I APOLOGIZED TO MR X; THEN INFORMED HIM I WAS IFR RATED; AS WAS MY ACFT. HE TOLD ME THE PROCS FOR FLYING UNDER THE CURRENT EMER RULES AND TOLD ME I COULD RETURN TO ZZZ. I FILED AN IFR FLT PLAN AND RETURNED TO ZZZ ARPT.