9/11 Anniversary: Live Stream Memorial and Museum Ceremony, Mike Pence at Flight 93 Memorial, Donald Trump at Pentagon

To commemorate the attacks of September 11, 2001, ceremonies will be held at the three crash sites in New York City, Arlington, Virginia and Shanksville, Pennsylvania.

Wednesday marks the 18th anniversary of the terror attacks that took the lives of almost 3,000 people. Nearly two decades after four planes were hijacked and crashed; many people who were alive that day can still remember where they were and what they did in the aftermath.

To ensure that people never forget the events of that day, honor those who lost their lives and remember those who exhibited immense heroism, places around the country host memorial services. The three main events, however, are held at the 9/11 Memorial and Museum, Pentagon and Flight 93 Memorial. Some of the events are closed to those who aren't family members, but the public can usually join in through live streams.

9/11 Memorial and Museum Ceremony Live Stream

Normally opened for visitors daily, the 9/11 Museum in New York City will be closed to the public for the entirety of Tuesday. The Memorial will be closed for the beginning of the day and open at 3 p.m. ET.

Occurring annually, the museum and memorial, located where the Twin Towers once stood, will once again host a ceremony to commemorate the heroism of first responders and honor those who lost their lives.

Family members of the victims of the 2001 and 1993 attacks at the World Trade Center will gather at the site for a ceremony, which is set to begin at 8:40 a.m. Similar to previous years, the ceremony will include a reading of a complete list of names of those who were killed.

Closed to the public, people can watch the ceremony live on the Memorial and Museum's Facebook page or website.

live stream 9/11 memorial ceremonies anniversary
Small American flags are placed in all 2,983 names on the 9/11 Memorial in New York City. On Wednesday, the memorial will be closed for most of the day because of the anniversary of the attacks. ceremonies. Alex Wroblewski/Getty

Pentagon Anniversary Ceremony

A memorial ceremony will also be held at the Pentagon, where one of the planes crashed 18 years ago. Chairman of the Joint Chiefs of Staff Marine General Joseph F. Dunford Jr. and Secretary of Defense Mark Esper will host President Donald Trump for a ceremony that is closed to the public.

At 6:46 a.m., just prior to the start of the ceremony, an American Flag will be unfurled down the side of the Pentagon, and the goal of the event is to allow the victims' families to observe the memory of their loved ones.

The ceremony will be broadcast on C-Span 1 at 9 a.m. and then again at 8 p.m.

United Airlines Flight 93 Memorial Ceremony

To mark the loss of those aboard United Airlines Flight 93, who fought back in an effort to regain control of the plane, a service will be held at the Flight 93 Memorial in Shanksville, Pennsylvania.

Flight 93 Memorial Plaza will open at 6 a.m. on Wednesday and the ceremony will begin at 9:45 a.m. At 10 a.m., the time the plane crashed, names of the passengers and crew members will be read and the Bells of Remembrance will rung in their memory.

Among the speakers set to deliver remarks at the ceremony is Vice President Mike Pence. Pence previously spoke at the memorial in TK and several outlets offered live streams of the event.

"I will always believe that I, and many others in our nation's capital, were able to go home that day to hug our families because of the courage and selflessness of the heroes of Flight 93," Pence said at the Flight 93 anniversary ceremony in 2017.

Those who weren't able to catch the ceremony live will be able to watch it at 9:15 p.m. on C-Span 1.

9/11 Anniversary: Live Stream Memorial and Museum Ceremony, Mike Pence at Flight 93 Memorial, Donald Trump at Pentagon | U.S.