A steel beam from the World Trade Center’s South Tower will be displayed at the Flight 93 National Memorial in Shanksville, Somerset County today, marking the 25th anniversary of the September 11, 2001, attacks. The display, part of the Tunnel to Towers Foundation’s “Steel Across America” tour, will be available for public viewing from 11 a.m. to 1 p.m. to honor first responders and service members.