A group of high school students worked to restore 19th century grave sites at the Green-Wood Cemetery during their summer internships. 

Cemetery president Richard Moylan says the seven students helped unearth and restore monuments that had no foundations in the section known as the "colored lots."

He says the burial sites of former slaves and descendants of slaves had been ignored and had sunk into the ground. 

The students restored more than 70 tombstones during their internship. 

Anthony Gonzalez says spending the summer in the cemetery doesn't seem weird anymore. 

"You have to thank your parents for giving you a great life," he says. 

Earlier this month, a group of volunteers from France helped restore the final resting place of Jean-Michel Basquiat, the world-renowned painter from Brooklyn.