Two people sit on a bench and watch construction of One World Trade.

Photo: Mario Tama/Getty Images

New York's tallest building

People sit on a bench in Exchange Place in Jersey City, N.J., on April 30 as construction continues on One World Trade Center in New York City.

Built to replace the twin towers destroyed in the Sept. 11, 2001 attacks, One World Trade Center is now the city's tallest building. Construction workers added a beam that put the height just beyond 1,250 feet — higher than the observation deck at the Empire State Building.

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An ironworker climbs down an iron column at the One World Trade construction site.

Photo: Lucas Jackson-Pool/Getty Images

Autographed beams

Iron worker Billy Geoghan climbs down an iron column autographed by people who were touched by the Sept. 11 tragedy after attaching beams on April 30 on the 100th story of One World Trade Center.
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Catie Leary ( @catieleary ) writes about science, travel, animals and the arts.