Some people have skeletons in their closet.

Others have 'em buried beneath their house.

That's the life lesson a group of construction workers learned in Fairmount on Saturday, when they unearthed seven old graves.

Police spokesman Lt. Frank Vanore said the workers made the bone-chilling discovery as they were excavating an empty property site on 20th Street near Poplar about 1 p.m.

"They dug through a heavy concrete plate," Vanore said. "At a certain depth, they found seven shallow graves and some remains."

Police and a representative from the city Medical Examiner's Office were called to the scene, as was an archaeologist.

Based on a preliminary analysis, the bones appeared to be about 100 years old, Vanore said.

"It's possible that land could've been a cemetery at one point," he said, adding that so far, the discovery has not merited a criminal investigation.