The Sept. 11 attacks forever changed the skyline of Lower Manhattan. Twenty-five years later, the absence of the Twin Towers and the rebuilding at the World Trade Center site remain among the most visible reminders of that day. Explore these images below, one from 1991 and the other from earlier this year, to see how the skyline looked before the attacks and how it has changed since. Both images were taken from the Staten Island Ferry.

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