Ground Zero: September 11, 2001 - September 11, 2011

 by Space Imaging’s IKONOS satellite showing the World Trade Center complex in Manhattan, New York, collected on June 30, 2001 showing the 110-stories twin towers; on September 15, 2001 showing the remains of the 1,350-foot (411.48-meter) twin towers of the World Trade Center, and the debris and dust that have settled in Ground Zero, four days after the terrorist attacks; and June 8, 2002, showing the progress in the reclamation of Ground Zero where the twin towers of the World Trade Center once stood.

A man stood in the rubble and called out, asking if anyone needed help, after the collapse of the first World Trade Center Tower on Sept. 11, 2001. More than 2,700 people were killed when Al Qaeda terrorists hijacked US passenger jets and flew them into the twin towers in New York.

An aerial view of the wreckage at the World Trade Center on Sept. 16, 2001. New York City Office of Emergency Management

A major section of Building 6 collapsed as demolition of the remaining piees of the World Trade Center continued on Dec. 18, 2001.

People watched out the window as construction continued at the World Trade Center site on March 26, 2010, in New York City. A new development agreement was announced after a 16-month stalemate over building at the site.

People stood on the 20th floor restaurant terrace of the World Center Hotel as construction continued on One World Trade Center and the National September 11 Memorial & Museum on July 8, 2011. The memorial features two reflecting pools on the footprints of the twin towers.

The World Trade Center ceremony marking the 10th anniversary of the attacks takes place at the National September 11 Memorial, Sept. 11, 2011 in New York.

A framed photo of the Twin Towers sits against a curb in honor of a 9/11 victim near Ground Zero during the 10th anniversary ceremony, September 11, 2011, in New York.