Because of the way it links art with history, engineering and graffiti (and a healthy dose of celeb worship), architecture is one of people's travel passions. In places like Newport, Rhode Island -- famous for its "Gilded Age" mansions -- touring the former homes of Rockefellers and Doris Duke is practically a must-do. Text by Lena Katz, JustLuxe.com. (GoNewport.com)