Shannon Stapleton / Reuters

A steel beam signed by President Obama was lifted high into the air on Thursday and installed on the 104th floor of One World Trade Center, a tower that once complete, will be the tallest building in the Western Hemisphere.

Obama's inscription, "We remember," "We rebuild," "We come back stronger!" marks the beam along with messages from First Lady Michelle Obama, Govs. Chris Christie and Andrew Cuomo, and Mayor Michael Bloomberg from their visit to the site, replacing the Twin Towers destroyed during the September 11th terrorist attacks.

Shannon Stapleton / Reuters

Iron workers Billy Geoghan (R) and James Brady secure a memorial beam, signed by President Obama and others, as it's hoisted to the 104th floor of One World Trade Center in New York.