Tell me that the tragedy of 9/11 was ten years ago, and it's hard for me to believe. In many ways it seems like just yesterday. Most of us remember exactly where we were, and what we were doing. I was on the air in Bozeman, Montana -- and my blood ran cold when news that the Pentagon had been hit came across the wire. Today, as Americans, we remember.

Communities across the country will be honoring those who were  lost in the tragedy. Below is a list of how some areas plan to remember the fallen.

New York City: The 9/11 Memorial will officially open on Sept. 11 with a ceremony for victims' families at Ground Zero. The  Memorial will then open to the public on the next day for visitors who reserved passes in advance. On Sept. 10, Community Board 1 will hold Hands Across Lower Manhattan, an event on the West Side Waterfront.

Washington, D.C.: Those who died in the attack  at the Pentagon will be honored at a ceremony of 700 people, including  family members of the deceased and members of the military. It will  take place at the Pentagon Memorial, which opened in 2008.

Shanksville, Pa.: A commemorative service to honor those who died on Flight 93 will take place at 9:30 a.m. ET on Sept. 11 at the Memorial Plaza.  Musical tributes, wreath layings, and additional activities will  continue throughout the afternoon.

Fort Collins: The city of Fort Collins will honor emergency responders during a Remembrance event at 6 p.m. today at Civic Center Park. The event will bring together community members and emergency responders for a time of reflection and appreciation.