If the United States had a giant attic, the Smithsonian's National Museum of American History would be it—and it provides the location for our most eclectic hunt. Recently renovated, the galleries are packed with memorabilia representing all eras and aspects of American life. You’ll search for Lincoln’s top hat, Clinton’s saxophone, Julia Child’s kitchen, monstrous machines, early cars, two full-size locomotives, vintage cars, the flag that inspired the national anthem, Dorothy’s ruby slippers, Fonzie's jacket, Mr. Rogers’ sweater, and Kermit the Frog.