BA32 FLC FLEW A VISUAL APCH TO THE WRONG RWY. AT 1000 FT AGL; THE CAPT (PNF) NOTICED THAT THE RWY ALIGNMENT WAS INCORRECT. FLC EXECUTED A GAR AND COMMUNICATED WITH ATC FOR A LNDG AT THE SCHEDULED DEST.

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DEPARTED ST LOUIS ON THE TURBO 2 DEP HEADED TO MWA UNDER VMC (EXTREME CLR; BRIGHT DAY). NORMALLY; WE FOLLOW THE TURBO 2 DEP UNTIL A HDG OF 090 DEGS TO MARION IS ESTABLISHED AND THEN DIRECT. DUE TO THE LACK OF ACTIVITY WITH CTR WE ASKED FOR AN EARLY TURN. WE GOT WHAT WE ASKED FOR AND A HDG OF 120 DEGS WAS ESTABLISHED. IT WAS THE FO'S LEG AND WE TRACKED TOWARD MWA VOR. CARBONDALE ARPT AND THE MARION ARPT ARE APPROX 10 MI APART; WITH SIMILAR; BUT DIFFERENT LAYOUTS. WE PICKED UP CARBONDALE'S ARPT FOR A VISUAL. WE HAD BRIEFED; TUNED IN AND IDENTED MARION'S NAVAIDS AND CALLED THE ARPT IN SIGHT. WE WERE CLRED FOR A VISUAL APCH. CTR NEVER MADE ANY COMMENTS TO US ABOUT ALIGNING OURSELVES TO THE WRONG ARPT. WE WERE HANDED OFF TO TWR. WE MADE SEVERAL CALLS TO MWA TWR AND WERE CLRED TO LAND. AT 1000 FT AGL I NOTICED THAT THE RWY ALIGNMENT WASN'T CLOSE ENOUGH TO OUR HDG INDICATORS. I CALLED FOR A 'GAR' WHICH WAS ACCOMPLISHED AT THAT POINT. I NOTICED THAT THE RMI WAS 90 DEGS TO THE L AND THE DME READ 10 NM. I CALLED MARION TWR AND TOLD THEM WHAT HAPPENED. I CALLED CARBONDALE TWR AND TALKED TO THEM. THEY SAID THERE WAS NEVER A CONFLICT AND THERE WAS NO PROB WITH THEM. CTR HAD CALLED THE CARBONDALE TWR TO SEE IF WE HAD MADE A LOW APCH. ACCORDING TO THE CTLR AT CARBONDALE; THEY BOTH HAD A GOOD LAUGH OVER IT. THIS WAS A DIFFERENT ROUTING THAN NORMAL. NEITHER PLT HAD EVER BEEN THE WAY WE WENT THAT DAY. NEITHER PLT HAD EVER BEEN TO OR NEAR CARBONDALE. WE HAD EXTREME FATIGUE. THE CAPT HAD RECEIVED A VERY LATE NIGHT PHONE CALL WHICH CAUSED HIM TO GET ONLY 3 HRS OF SLEEP THE PREVIOUS NIGHT. THE FO HAD ALSO RECEIVED 4 HRS OF SLEEP THE NIGHT BEFORE DUE TO PEOPLE IN THE ADJACENT ROOM MAKING NOISE ALL NIGHT. ALSO CONTRIBUTING; ATC GAVE US A 'CLRED TO LAND' CLRNC WITHOUT HAVING VISUAL CONTACT WITH US; AND WE DID NOT UTILIZE THE NAVAIDS AVAILABLE; EVEN THOUGH THEY WERE TUNED AND IDENTED.