The Flight 93 National Memorial plaza in Shanksville, Pennsylvania, features black concrete that is designed to evoke an airplane wing, and rows of gleaming benches to honor the 40 people who perished. When the plane was hijacked by terrorists on Sept. 11, 2001, the crew and passengers onboard heroically regained control of the plane and forced it into a field in Shanksville. The action likely averted the terrorist’s plan to crash the plane into the U.S. Capitol Building or White House. Construction for the site is still underway.
(Photos: Mark Wilson/Getty Images; Jason Cohn/Reuters)