There are several buildings, most of which have been maintained - these photos are of the older, derelict parts which date from the 1870s. Here is the front of the administration building, now home to a beauty spa.
Here you can see part of the remaining wall - it was called the Ha-Ha Wall and most of it has been taken down, perhaps when it was closed as a hospital in the '70s.
Some more images below the cut
You can see pencil marks scribbled in red, under the window.
One of my favourites: on the left is the exterior wall, the middle would have been a brick wall (now removed) and the white on the right is the interior wall.
You can see the rest of them at my website.