Mount Diogenes is a small steep-sided volcano known as a mamelon that was formed six million years ago over a vent in the earth. It rises 105 metres from the surrounding plains. Erosion has created a number of unusual rock formations that have been given names such as 'Queen Mary's Profile', 'Vampire Cliff', 'Stonehenge', 'The Chapel' and the famous 'Hanging Rock'.
Hanging Rock was made famous by the movie 'Picnic at Hanging Rock' in which a number of school girls mysteriously disappeared, never to be seen again.
As well as an 'energetic' walk to the top of the rock, which provides a magnificent view of the surrounding countryside, the reserve allows for a number of other activities, including cricket, tennis, fishing, walking, picnics, horse racing and an annual screening of the movie.
The discovery centre explains how the rocks were formed and provides a history of aboriginal and white settlement.