The Camera Obscura (precursor to the modern camera) at Pretoria University is a marvellous invention allowing you to view the whole of Pretoria as you change the direction of the lenses and the view is projected in a darkened room. You'll even be able to see birds and people scurrying around. It's recommended that you visit in the mornings to see the best view of the city centre when it's illuminated by the sunlight from the east. On a clear day, they say it's possible to see vehicles on the pass in the Magaliesberg leading to Pretoria North.