Among the new elements of the site released Thursday were the Memorial Hall, a 1.5-acre clearing at ground level for public gatherings, and the exposed stumps of columns that supported the twin towers.

• 周四公开发布的新的设计包括纪念馆，与地面齐平的1.；5英亩的空地（作为公共集会区），还有暴露在地面上的支撑双塔的残余柱桩。