A U.S. flag is stuck in the broken window of a building on the grounds of the now-closed Bethlehem Steel mill in Bethlehem, Pennsylvania, U.S. April 21, 2016. After Bethlehem Steel's blast furnaces went silent 20 years ago in the city of Bethlehem, Pennsylvania, the local economy bounced back as new industrial parks filled with e-commerce companies and white-collar businesses fleeing New York's higher costs. That adds to the challenge for Donald Trump, Republican nominee for the U.S. presidency, as he seeks voters' backing in the state's primary on April 26. REUTERS/Brian Snyder SEARCH "BETHLEHEM STEEL" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY