The photo is very misleading as basically the whole fort has been blasted away by quarrying. Fortunately various finds were discovered during 'rescue excavations' 1954,59 and 60. These can be read about in the link below.
As for the site now all that can be seen is the blasted front of a hill just south of Newburgh. It was quite sad having a look round trying to imagine what once was. Still there are loads of other forts in an area that seems to have gone quarrying daft.