Thirteen years ago, terrorists killed nearly 3,000 innocent people in New York City, the Pentagon and Shanksville, Pa. Today, communities across the nation pay tribute to the fallen, their families and those who fought in their honor.

1. Firefighters

Salinas Fire Station 1 in California hosted a moving ceremony for the community.

Photo: Vern Fisher via Twitter

Photo: Vern Fisher via Twitter

At 6:45 a.m., the Bob Hope Airport Fire Department in Burbank, Calif., honored those who lost their lives.

Photo: Bob Hope Airport ?via Twitter

Photo: Bob Hope Airport ?via Twitter

2. Police

Sarasota Police Department in Florida hosted a remembrance ceremony at its headquarters.

Photo: Sarasota Police Department Facebook

Photo: Sarasota Police Department Facebook

Photo: Sarasota Police Department Facebook

Photo: Sarasota Police Department Facebook

Sgt. Lori Jaress was on special detail with President Bush in Sarasota on Sept. 11, 2001.

Photo: Sarasota Police Department Facebook

Photo: Sarasota Police Department Facebook

3. Teachers

Mrs. McBrayer replayed the devastating images from New York for her class.

Keicher Elementary sixth graders recounted events of the day on new Chromebooks.

Miami-Dade County Public Schools prepared care kits for soldiers.

4. College students across the nation placed American flags around campus.

5. Veterans

Members of the Whitestone Veterans Memorial Day Association hosted this ceremony in New York:

Photo: Devin O Connor via Twitter

Photo: Devin O Connor via Twitter

6. Those near the Pentagon

Relatives place flowers and rest on the benches of the National 9/11 Pentagon Memorial in Arlington, Va.

Pentagon Memorial at the Pentagon (Photo: Newscom)

Pentagon Memorial at the Pentagon (Photo: Newscom)

The White House marked the anniversary with a moment of silence on the South Lawn.

President Obama, First Lady Michelle Obama and Vice President Joseph Biden. (Photo: Newscom)

President Obama, First Lady Michelle Obama and Vice President Joe Biden. (Photo: Newscom)

The U.S. Capitol flew its flag at half-staff.

6. Those in New York City

All victims’ names are read at the World Trade Center site.

Photo: ABC News via Twitter

Photo: ABC News via Twitter

The South Tower Pool is lined with flowers during the memorial observances held at the site of the World Trade Center.

Photo: Newscom

Photo: Newscom

Photo: Newscom

Photo: Newscom

Paola Braut cried over a photograph of her son Patrice along the edge of the North Pool.

Photo: Newscom

Photo: Newscom

7. Those near Shanksville, Pa., braved the rain to honor the fallen passengers and crew of Flight 93.

Family members of the victims of the crash of United Airline Flight 93 walks the path leading to the actual crash site at the Flight 93 National Memorial. (Photo: Newscom)

Family members of the victims of the crash of United Airline Flight 93 walk the path leading to the crash site at the Flight 93 National Memorial. (Photo: Newscom)

How do you remember?