Yahoo News photographer Gordon Donovan returned this week to the scenes of many memorable images taken on Sept. 11, 2001, closely matching them with images from today.

Since 2001, new obstacles have arisen, requiring some adjustments in camera angles to align with photographs taken on the day of the terrorist attacks. This is the fourth time Donovan has revisited the New York skyline; each year presents new challenges as the landscape changes. (Yahoo News)


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