In Omaha, an evening stroll can provide passage into a fascinating past. Travel from a madam's elaborate grave in North Omaha to the site of the first U.S. airmail flight in Aksarben. Chase down the echoes of a Duke Ellington performance at the Dreamland Ballroom in the Jewell Building. Stow away on a tour that treats the whole city like a museum. Colorful street murals and Gilded Age mansions stand in as exhibits alongside the more traditional offerings...