Thirteen's continuing series, The City Concealed, heads to Brooklyn to take a look inside Green-Wood Cemetery for their second installment. The video tour visits the tombs and catacombs, and includes a little history lesson as well. Established in 1838, the cemetery has plenty of living roaming the grounds for the art and architecture alone--but as historian Jeff Richman notes in the video, some "fear the spirits" and refuse to visit.