2. Tribute in Light

In 2002, the Municipal Art Society of New York (MAS) officially debuted Tribute in Light, a 9/11 memorial and art installation that utilizes 88 searchlights to form two vertical beams of blue light. The tribute was presented annually by MAS until 2012, when the 9/11 Memorial Museum took over the role. On a clear night, the lights can be seen within a 60-mile radius, and reach four miles into the sky.

See how the Tribute in Light is illuminated in this behind the scenes piece.