Today the memorial museum to those lost on 9/11 was dedicated in an emotional ceremony at ground zero in New York City.

President Obama was on hand at the official dedication for the National September 11 Memorial Museum earlier today, and according to usatoday.com, he spoke these words:

"To all those who responded with so much courage ... it is an honor for us to join in your memories, to recall and reflect but above all to reaffirm the true spirit of 9/11: love, compassion, sacrifice and to enshrine it in the heart of our nation forever."

The museum spans seven stories, mostly underground, and contains artifacts from the attack on the World Trade Center Towers on September 11, 2001.

Those artifacts include the 80 ft high tridents, the so-called 'Ground Zero Cross,' the destroyed remains of Company 21's New York Fire Department Engine along with smaller items such as posters of missing loved ones projected onto the wall of the museum.

It will open to the public on May 21.

Take a moving tour of the museum through photos and videos at nytimes.com.