ACR MLG BROKE OFF VECTOR FOR ILS APCH AND MISTAKENLY STARTED VISUAL APCH TO WRONG ARPT.

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WE WERE BEING VECTORED FOR AN ILS APCH TO BURBANK RWY 7; WHEN I SAW RWY 15 OUT THE LEFT WINDOW. WE ASKED FOR AND RECEIVED A VISUAL APCH CLRNC TO RWY 15. AS WE STARTED TO PROCEED TOWARD THE ARPT; I THOUGHT WE WERE QUITE HIGH FOR AN ARPT THAT SHOULD HAVE BEEN FURTHER AWAY. AS WE GOT CLOSER; RWY 7 WAS NOT VISIBLE XING THE SOUTH END OF RWY 15. IT WAS THEN I REALIZED THAT THE RWY IN VIEW WAS THAT OF VAN NUYS ARPT; ABORT 8 MILES TO THE WEST OF BURBANK. A SUBSEQUENT PULL UP; COORDINATION BY THE TWO TWRS; AND APCH CTL; RESULTED IN A NORMAL APCH AND LNDG. WHEN MAKING THE ILS TO BURBANK; THERE IS A XING ALT OF 3000' OVER VAN NUYS ARPT FOR TFC PATTERN SEPARATION. DURING THE APCH IN THE VICINITY OF VAN NUYS; WE STOPPED OUR DESCENT AT 2300 MSL. I AM VERY FAMILIAR WITH THE LA; BURBANK AREA; HAVING FLOWN IN AND OUT OF THE ENTIRE AREA OVER THE PAST 20 YEARS AS A CIVILIAN PLT; COMMUTER PLT; AND NOW AIRLINE. HOW DID I MAKE THE SAME MISTAKE THAT YOU TRY TO AVOID YOUR ENTIRE CAREER. I WAS LOOKING AT THE CORRECT ARPT INITIALLY; BUT DURING THE VISUAL APCH WE FLEW OVER TERRAIN THAT ACTIVATED THE GPWS. AFTER PASSING OVER THE HILLS; THE GPWS CONTINUED TO SOUND. IT WAS THEN DEACTIVATED. I HAD FORGOTTEN EXACTLY WHERE THE SWITCH WAS FOR THE GPWS; AND IT TOOK A FEW MINUTES TO LOCATE IT. MEANWHILE THE WARNING WAS CONTINUOUS; TERRAIN; TERRAIN; TERRAIN. WHEN IT WAS FINALLY SHUT OFF; A NICE LONG RWY APPEARED OUT THE WINDOW AND I GRABBED IT. BUT IT WAS THE WRONG ONE. LOOKING BACK; IF I HAD JUST TOLD THE F/O TO BE DEACTIVATE THE GPWS; AND CONCENTRATED ON FLYING TO THE ARPT; THIS NEVER WOULD HAVE HAPPENED. A SUBSEQUENT PHONE CALL TO BURBANK TWR AND APCH CTL SMOOTHED THINGS OUT QUITE NICELY.