Already one of Beantown’s best attractions, the Skywalk Observatory (refer to listing, page 43) at the top of the Prudential Tower now has something new for those eager to glimpse a bird’s-eye view of the city. The Dreams of Freedom: Boston’s Immigrant Experience exhibit recently unveiled a major renovation that enhances the longtime display, illuminating the Hub’s nearly 400-year history of welcoming newcomers to these shores. Highlights include interactive features where visitors can test their knowledge of American government, information on Boston’s ever-changing immigrant demographics and an updated film, Dreams of Freedom: The Boston Story, that is narrated by local comedian Jimmy Tingle and features an interview with Boston Mayor Martin J. Walsh, himself the son of immigrant parents.