For 10 points, name this event memorialized by the Freedom Tower at Ground Zero.
A photograph taken during this event shows Marcy Borders in an all-yellow room covered in dust. Two huge waterfalls inside oak forests were designed by Michael Arad after this event. A composition about this event uses a tape recorder that repeats the word "Missing" and reads a list of (*) names. After it, 88 searchlights were installed to make the Tribute in Light. Daniel Liebiskind designed a tower with triangular facades after this event. John Adams' "On the Transmigration of Souls" was written in response to it. The "Falling Man" photo was taken during it. For 10 points, name this event memorialized by the Freedom Tower at Ground Zero.
A photograph taken during this event shows Marcy Borders in an all-yellow room covered in dust.
September 11th terrorist attacks [or 9/11; or the attacks on the World Trade Center or the attacks on the Twin Towers; or any other equivalents]