Classic Map: After destroying the first Wraith's Soul, search for a Skull Switch near the stairs leading to the Wraith. This opens a tunnel on the other side of the area. Go inside, follow the blood trail, hop up and use the lever here (where the blood trail ends). The Classic Map is found nearby.
Cosmoguy Collectible: At the left stairs leading to the second Wraith, drop down the crack/hole in the stairs to find this collectible.