“American Celebration on Parade” at Shenandoah Caverns In 1966 Earl C. Hargrove, Jr., owner of Hargrove, Inc. in Lanham, Maryland, purchased Shenandoah Caverns. Mr. Hargrove’s company was responsible for the creation of parade floats and props for every Inaugural since Truman’s in 1949, as well as Miss America Pageants, PhiladelphiaRead More …