We went on a tour of the Serrailes mansion and it included entrance to this overlook. There's no signage as to where the entrance is and what appears to be some entrances are closed off. We walked around to where another gated fence was and a security guard let us in upon showing our tickets.
Elevator is out of commission so you have to climb probably 6 flights of stairs so if you are taking someone who is disabled tough luck!
As for the views of the city, they're ok, but not the best. I think the best part of it is the history and architecture of the cross itself. read more