http://www.history.com/photos/pennsylvania History.com's state gallery for Pennsylvania. Learn more about the state symbols and famous landmarks. en Copyright 2013, History.com Thu, 23 May 2013 04:00:00 GMT History.com 2013-05-23T04:00:00Z en Copyright 2013, History.com http://www.history.com/photos/pennsylvania/photo1 In the early part of the 19th century, Harrisburg served as a stopping point along the Underground Railroad. The city is situated along the Susquehanna River. http://www.history.com/photos/pennsylvania/photo1 http://www.history.com/photos/pennsylvania/photo2 The Liberty Bell, located in Philadelpha, PA, is one of the most prominent symbols of the American Revolutuionary War. http://www.history.com/photos/pennsylvania/photo2 http://www.history.com/photos/pennsylvania/photo3 Both the Declaration of Independence and United States Constitution were signed at Independence Hall. http://www.history.com/photos/pennsylvania/photo3 http://www.history.com/photos/pennsylvania/photo4 Benjamin Franklin, seen here in a 1778 portrait by Joseph Duplessis, is one of Philadelphia's most famous residents http://www.history.com/photos/pennsylvania/photo4 http://www.history.com/photos/pennsylvania/photo5 Philadelphia's City Hall is the largest municipal building in the U.S. and the tallest masonry building in the world standing at 548 ft. http://www.history.com/photos/pennsylvania/photo5 http://www.history.com/photos/pennsylvania/photo6 Founded in 1758 Pittsburg officially incorporated as a city in 1816. It's Pennsylvania's second largest city. http://www.history.com/photos/pennsylvania/photo6 http://www.history.com/photos/pennsylvania/photo7 Steel production began in 1875. By 1911, Pittsburgh produced almost half of the nation's steel. http://www.history.com/photos/pennsylvania/photo7 http://www.history.com/photos/pennsylvania/photo8 "Silver Clouds" at the Warhol Museum in 2006. Andy Warhol was born in Pittsburg. http://www.history.com/photos/pennsylvania/photo8 http://www.history.com/photos/pennsylvania/photo9 Pennsylvania is considered the "Cradle of Quarterbacks." The state has produced such stars as Joe Montana (seen here in 1984), Dan Marino, Joe Namath and Johnny Unitis. http://www.history.com/photos/pennsylvania/photo9 http://www.history.com/photos/pennsylvania/photo10 Coal was one of Pennsylvania's main industries. Here we see child coal miners from Hughestown, PA in 1911. At the time, there were no child-labor laws. http://www.history.com/photos/pennsylvania/photo10 http://www.history.com/photos/pennsylvania/photo11 The Steelers won the 2009 thanks in part to James Harrison's (seen here) record setting 100 yard interception return which resulted in a touch down. http://www.history.com/photos/pennsylvania/photo11