Halloween is only two days away! The fifth and final hotel in my series of haunted hotels is Omni Park House in Downtown Boston. Founded by Harvey D. Parker in 1855, this historic gem is longest continuously operating hotel in the United States. It was here where such 19th century luminaries as Ralph Waldo Emerson, Henry David Thoreau, Nathaniel Hawthorne, and Henry Wadsworth Longfellow convened in the Saturday Club. Baseball legends met like Babe Ruth and Ted Williams wined and dined at the historic property. What's more, a slew of respected politicians --from Ulysses S. Grant and Franklin Delano Roosevelt to Deval Patrick -- gathered here for press conferences and meetings. Here are some other fun facts: John F. Kennedy proposed to Jackie Onassis at Parker's Restaurant, where Malcolm X once worked as a busboy  With its close proximity to Boston's Theater District, the Omni Parker House played an important role in the careers of a wide range of performers, inclu...