The National September 11 Memorial and Museum has become one of New York City’s most sought-after tourist spots since it opened last May. At the center of it is an exhibit that was spearheaded by Puerto Rican artist and New Yorker Ricardo Mulero, who led a team of artists, architects and engineers in arranging the artifacts of that fateful day in history.

Mulero previously worked at the U.S. Holocaust Memorial Museum and at Freedom Park in Pretoria, South Africa, but this project was unique. “Unlike any other history project that I have worked on, it was something that I had been part of,” Mulero told NBC News. “That became kind of interesting.”

You can see images of the exhibit over at NBC News