For those having trouble finding the manor, there is a plateau slightly northwest of Durnholde Keep in Hillsbrad Foothills. At the back of this plateau, where it meets the mountains (the Alterac Mountains, incidentally), you should find a small path leading up into the mountains . This path twists back and forth, goes through a small cave, and then leads to Ravenholdt Manor. There is a chest that used to spawn Milton Beats if you open it.
See Ravenholdt for more information.
Fangs of the Father
Rogues involved in the Fangs of the Father quest line travel to Ravenholdt Manor as part of the long path to obtaining the legendary daggers. The real reasons for traveling there are a well-guarded secret.