A 57-year-old Park Slope man was recently reunited with a prized possession he thought was lost forever.

Veteran photographer William Lopez has never talked about the horrors he witnessed on 9/11 until now.

"One of the photographers looked at me and he said, ‘Why are they jumping?’ And I was like, ‘What are you talking about?’ and what I thought were embers shooting out from the building, but when I looked closer, it was just, it was bad,” Lopez recalled.

The Park Slope photographer was only 32 at the time.

“I've kind of put Sept. 11 behind me and I was kind of there at a very bad time as a journalist because I was there when people actually died,” Lopez said. “So, it's something I've never talked about, and I've never done anything with my photos ever.”

After the towers fell, he submitted his pictures and walked away, but hours later, something drew him back to ground zero. He witnessed the joy of two firefighters who found each other.

"I caught that moment where they were hugging,” he said.

That photo is now in the Library of Congress.

"Thinking back, it was wonderful to capture a positive moment but on the day, I was numb,” said Lopez.

Lopez was honored with a plaque at an FDNY charity event, but he lost it in a move over a decade ago.

About three years after Lopez lost his plaque in Park Slope, Sheena Pisarro was walking down Meserole Street in East Williamsburg when she noticed something that didn't belong, propped up against some black trash bags.

"I brought it home and I put it on a shelf,” Pisarro said.

Pisarro didn't know who it belonged to until recently, when a leak forced her to move the plaque and she saw the tag on the back.

"I think the timing was really kismet as well, because it was just right on the heels of the Sept. 11 24th anniversary,” said Pisarro.

It was a reunion that meant everything to Lopez.

“I lost some of my archives and I went through almost like the stages of mourning where you lose something and then you accept it,” Lopez said. “You go through acceptance and then you heal and it was forgotten about. So, it was just like a flood of emotions. We were both crying when we got it back.”

It was a special moment for Pisarro, too.

“There is a lightness, you know, I mean, as a New Yorker, a native New Yorker, you know, we're all connected to what happened that day,” Pisarro said. “These guys were really they were out there. They were right under the towers, shooting. It was just one of those moments where you say, wow, you know, this is really New York and this is special and I'm somehow, you know, connected.”