 In 1935 Hagglund followed up his discovery of Royal Savage with the discovery of Philadelphia 's remains , sitting upright on the lake bottom . He raised her that year ; she is now on display at the Smithsonian Institution in Washington , D.C. , and is listed on the National Register of Historic Places and is designated a National Historic Landmark . The site of the battle , Valcour Bay , was declared a National Historic Landmark on January 1 , 1961 , and added to the National Register on October 15 , 1966 . 
