Monday marks 16 years since the deadly terrorist attacks that changed the U.S. forever.
Nearly 3,000 people were killed on September 11, 2001, when hijackers flew commercial airplanes into New York's World Trade Center, the Pentagon and a field near Shanksville, Pennsylvania.
Plans to honor those killed are happening across the country.
Thousands will gather at Ground Zero for a ceremony honoring those killed. The name of each victim will be read at the National September 11 Memorial and Museum.
There will also be six moments of silence beginning at 8:46 a.m. EST when the first plane hit the North Tower, followed by 9:03 a.m. EST when the second plane hit.
In Nebraska, Lincoln Police, the Lancaster County Sheriff's Office and Lincoln Fire and Rescue will honor the heroes of September 11. A ceremony will take place on the north steps of the state capitol at 8 a.m.
Lincoln Police Chief Jeff Bliemeiser, Lancaster County Sheriff Terry Wagner and Lincoln Fire and Rescue Chief Michael Despain are all scheduled to speak.
The Strategic Air Command and Aerospace Museum will be hosting a program and free lunch event honoring first responders and military men and women. That lunch and program is from 11:30 a.m. to 1 p.m. in Ashland.
First Baptist Church in Scottsbluff will to host "Cry Out America" Pray! Patriot Day 9/11 prayer event. That's from 7 to 8 a.m. at 3009 Avenue I in Scottsbluff.
In Washington, D.C., President Donald Trump and the first lady will honor the day with a moment of silence at the White House.
Vice President Mike Pence will observe the day at the 9/11 memorial in Shanksville.