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The National September 11 Memorial Museum is located at the site of the World Trade Center in Lower Manhattan.

Dedication: Thursday; opens to general public May 21 (sold out).

Operator: Non-profit foundation.

Admission: $24 adults; $18 seniors, veterans and college students; free for 9/11 family members and rescue/recovery workers who register; free to all 5 to 8 p.m. Tuesdays.

Exhibition space: 110,000 square feet.

Exhibits: The historical exhibit tells the story of the 9/11 attacks and related events. The memorial exhibition features photos of everyone killed in the attacks.

Cost: $700 million for the memorial (dedicated 9/11/11) and museum, from private donations and government grants.

Artifacts: Wrecked Fire Department Engine 21; structural steel from the upper floors of the World Trade Center's North Tower, which bore the brunt of the crash by a hijacked airliner; the leash of a police dog killed in the attack; a pair of high heels in which an office worker fled the South Tower; the helmet of a fire lieutenant who survived the collapse of the North Tower.

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