 Reported hauntings in the state are linked to such historic places as the Oregon Trail and early coastal communities, as well as the history of Portland, the state's largest city and metropolitan area, which was considered one of the most dangerous port cities in the world at the beginning of the 20th century.During 2012, "USA Today" named Portland among the top ten most haunted cities in the United States.Allegedly haunted locales in Portland include the Bagdad Theater, a vaudeville theater built by Universal Studios during 1927; Pittock Mansion, a mansion overlooking the city; the Roseland Theater, a former church and music venue; and the city's Portland Underground (or so-called shanghai tunnels), made up of various passages beneath the streets of northwest Portland that were used to smuggle prostitutes and sailors onto ships in the port, where they were often sold into slavery or forced labor.