It's the 60th year of New York Mets baseball, and we celebrate this week with a look back at the transformational multipurpose facility they called home for 45 seasons - including three of the club's four NL pennants and its only two World Series championships - Shea Stadium.   Matthew Silverman (Shea Stadium Remembered: The Mets, The Jets, and Beatlemania) takes us back to the origin story behind the conceptually named "Flushing Meadow Park Municipal Stadium" - which began almost immediately after the Dodgers' and Giants' relocation to California in 1958 as a lure for a new expansion franchise to replace them.   Through the combined political efforts of New York City mayor Robert Wagner, city urban planning power broker Robert Moses, and Continental League founder (and future stadium namesake) William Shea, the Queens-based facility opened in 1964 as the mutual home of not only the NL expansion Mets, but also the newly reincarnated AFL football New York Jets (née Titans).   We delve into more than four decades of Shea memories, including the 1969 "Miracle Mets," the Jets' 1968 AFL Championship, Bill Buckner's ill-fated error in Game 6 of the 1986 World Series, and the insane year of 1975 - when the AL Yankees and football Giants also called the stadium home.   And, of course, the iconic first stop on the Beatles' 1965 tour of North America - the biggest-ever grossing concert of the era that became synonymous with "Beatlemania."