into the wide blue yonder
To a location far away that is appealingly unknown and mysterious. I often dream about selling all my possessions, buying a plane ticket to Europe, and setting off into the wide blue yonder.
the wide (or wild) blue yonder
the sky or sea; the far or unknown distance. The phrase comes from ‘Army Air Corps’ ( 1939 ), a song by Robert Crawford : ‘Off we go into the wild blue yonder, Climbing high into the sun’.