Travel advisory board crystals are seen on the wall of a hotel in New York City, October 21, 2017.(REUTERS/Brendan McDermid) A guide to India’s latest travel advisors: A travel advisory board crystal is seen on a wall in New Delhi, India.(Reuters/Bharat Agnihotri) Advisory board crystal seen on hotel windows in Newark, New Jersey, October 22, 2017.(Reuters/Brenden McDermID) The …