9/11 then and now: Poignant pictures show terror attack site 17 years on

Yahoo News US photographer Gordon Donovan recently returned to the scenes of many memorable images taken in New York City on Sept. 11, 2001.

Donovan photographed the same areas to show what has changed since the terrorist attacks 17 years ago.

New obstacles have arisen, requiring some adjustments in camera angles to align with the original images

This is the seventh time Donovan has revisited the New York skyline to document changes since 9/11; each year presents new challenges as the New York City landscape changes. (Yahoo News)