The U.S. commemorates the 25th anniversary of 9/11
A visitor pauses at the reflecting pools to commemorate the 25th anniversary of the September 11th terrorist attacks on the World Trade Center at the National 9/11 Memorial & Museum. Jeenah Moon | Getty Images On September 11, 2001, members of Al-Qaeda hijacked four passenger airliners. They flew two planes into the twin skyscrapers of…