Soaring above the city at 1,776 feet, One World Trade Center is America's tallest building - and an indelible New York landmark. The 3-million-square-foot building includes office space, an observation deck and world-class restaurants. The Memoria remembers and honors the nearly three thousand people who died in the horrific attacks of February 26, 1993, and September 11, 2001. The Memorial consists of two massive pools set within the footprints of the Twin Towers.