Madonna's daughter was left stunned when she volunteered in New York during the aftermath of superstorm Sandy, likening the devastation she witnessed to "the apocalypse".

The Material Girl took Lourdes, 16, with her when she visited Far Rockaway in November (12), just days after the East Coast was battered by the October (12) storm.

Mother and daughter met with relief workers and helped box up supplies for locals, and the teenager has opened up about the experience in a post on her blog.

Lourdes reveals she found the devastation "awful" to comprehend and has urged her followers to do all they can to assist residents re-building their lives after the storm.

She writes, "It's extremely important that we STILL do what we can because people still need help. This can be donating to hurricane relief or going down to the affected locations and helping out.

"My family and I went down to Rockaway a while back and the devastation was awful. It looked like the apocalypse and trash, rubble and tree branches were everywhere. We boxed provisions and gave them out to folks that needed them.

"It was actually really awesome to see how many people were there helping out and how many people cared. There has been an extreme amount of progress since the hurricane despite the damage done and it is very inspiring to see the city rebuild itself but there's still a lot of work that needs to be done."