**ADVANCE FOR TUESDAY, JULY 17** Adrian and Elizabeth Reddall of England, right, listen to historic interpreter Martha Czernicki, left, lead a tour of The Mark Twain House in Hartford, Conn., Wednesday, June 4, 2008. Mark Twain, Edith Wharton and a host of other boldfaced names among the dead have something in common with living Americans in these hard financial times: Their homes are in jeopardy. For scores of historic house museums, simply keeping the lights on has become a challenge. (AP Photo/Jessica Hill).