3.8 billion dollars, cost of ONE WTC, 8 YEARS, time to build ONE WTC, 1,176 FEET, height of OWTC, 541 METRES, equivalent of 1,176 feet in the metric system, 16 ACRES, land area of the site, 2011, opening of the memorial, 2,977, number of names on the memorial, 2014, opening of the museum, 70 feet / 21 metres, depth of the museum (it is underground), 23,000, images you can see in the museum, 500, hours of video you can see, 10,300, number of artifacts you can see.

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