"Once Upon a Place" is the story of "La Nacional," a nondescript building in New York City that welcomed thousands of immigrants to the United States over its 150-year history. Its striking story is the story of the ebb and tide of Spanish immigration to this country; of the rise and fall of New York City as home to the American Dream, and the tale of hundreds of lives touched by the possibility of a new life. Yet that story of immigrants to America, so relevant today, remains a mystery to most New Yorkers and Americans.