Monday marks 22 years since the day the country watched in horror as hijacked airplanes crashed into the World Trade Center in New York City, the Pentagon in Washington, D.C., and a field in Shanksville, Pennsylvania. The attack killed 2,996 people, making it the deadliest foreign attack ever on U.S. soil. Another 10,000 first responders and others who were in the World Trade Center area have been diagnosed with cancer. And more than 2,000 deaths have been attributed to 9/11 illnesses. These are some of the unforgettable images from that day. 📸: Robert Giroux/@GettyImages Stan Honda, Doug Kanter/@afpphoto/@GettyImages Ernesto Mora, Suzanne Plunkett, Gene Boyars, Richard Drew/@apnews Thomas E. Franklin/The Bergen Record