Arlington National Cemetery illustrates the evolution of the cemetery from a potter's field during the Civil War to the most prestigious military cemetery in the United States. The cemetery contains such significant monuments and sites as the Tomb of the Unknown Soldier, the Rough Rider Monument, the mast of the USS Maine, the Confederate Monument, and Freedman's Village. Today not only can one visit the graves of Supreme Court justices, George Washington Parke Custis, Pres. William Taft and Nellie Taft, and Pres. John F. Kennedy and Jacqueline Kennedy Onassis, but one can also see the burial places of generals and admirals, Medal of Honor recipients, doctors and nurses, land and space explorers, inventors, and soldiers.