4. World's largest museum attraction - Titanic Museum in Branson, Missouri, United States

This half-scale ship (http://www.titanicbranson.com) has only been open since 2006, and already more than 1 million guests have walked an elegant replica of the Titanic's Grand Staircase, and stood on the mighty ship's bridge. Your visit begins when they hand you the boarding pass of an actual Titanic passenger, and you check out the Memorial Wall to see if they lived or died.