Gallery: 911 museum opens

In this May 5, 2014 photo released by the National September 11 Memorial Museum, a firetruck, damaged in the attacks of September 11, 2001, is on display at the New York museum. Photo: AP

The "Survivor Stairs," left, from The World Trader Center, are displayed at the National Sept. 11 Memorial Museum in New York. Photo: AP

The burn mask, right, of a World Trade Center survivor who was injured by burning jet fuel, is displayed at the National Sept. 11 Memorial Museum. Photo: AP

Visitors to the Sept. 11 Memorial peek through a window at pair of World Trade Center tridents displayed inside the Sept. 11 Museum in New York. Photo: AP

A fire-scorched cab of a New York City Fire Department truck, damaged in the attacks of Sept. 11, 2001, in storage at JFK Airport in New York. Photo: Mark Lennihan/AP

This slipper is an artifact from the 9/11 attacks that is to be part of the National September 11 Memorial Museum, which will be dedicated in a ceremony. Photo: Mark Lennihan/AP

File photo shows electronic images of victims of the attacks of September 11, destined to be a part of the future 9/11 Memorial Museum. Photo: Mark Lennihan/AP

Two tridents from the World Trade Center are on display inside the National September 11 Memorial Museum before a dedication ceremony at the museum in New York. Photo: Allan Tannenbaum/AP

The pavilion entrance to the National September 11 Memorial Museum, left, is next to one of the memorial reflecting pools, right, at the World Trade Center. Photo: Mark Lennihan/AP

Former New York City Mayor Rudolph Giuliani speaks at the dedication ceremony at the National September 11 Memorial Museum in New York. Photo: Mike Segar/Reuters

"The Final Column" is displayed during the dedication ceremony of the National September 11 Memorial Museum in New York. Photo: Chris Pedota/Retuers

A woman places a hand on the names engraved along the South reflecting pool at the Ground Zero memorial site at the National September 11 Memorial Museum. Photo: Spencer Platt/Reuters

US President Barack Obama, former New York Mayor Michael Bloomberg, Michelle Obama, former US President Bill Clinton and wife, former Secretary of State Hillary Clinton tour the National September 11 Memorial Museum in New York. Photo: Kevin Lamarque/Reuters

US President Barack Obama and former New York Mayor Michael Bloomberg walk near Ladder 3 as Obama tours the National September 11 Memorial Museum in New York. Photo: Kevin Lamarque/Retuers

Invited family and friends of 9/11 victims cry while US President Barak Obama speaks about Wells Crowther who scarified himself to save others during the Sept 11, 2001 attacks. Photo: Chang W. Lee/Retuers

US President Barack Obama speaks at the dedication ceremony at the National September 11 Memorial Museum in New York. Photo: John Angelillo/Reuters

President Barack Obama speaks during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York. Photo: Richard Drew/Reuters

A quote from Virgil fills a wall of the museum prior to the dedication ceremony at the National September 11 Memorial Museum in New York. Photo: John Munson/Reuters

Artifacts of the historical exhibition are seen inside the National September 11 Memorial & Museum during a press preview in New York. Photo: Shannon Stapleton/Retuers

The Last Column of the World Trade Center is seen inside the Foundation Hall section of the National September 11 Memorial & Museum during a media preview in New York. Photo: Shannon Stapleton/Reuters

The antenna from the North Tower of the World Trade Center is seen inside the National September 11 Memorial & Museum during a press preview in New York. Photo: Shannon Stapleton/Retuers