Answer:
on a deserted or isolated place
Step-by-step explanation:
The expert paints the picture of some empty, wistful place in the deserted countryside.
It mentioned it was a “dull, dark and soundless” day, which tells us there were no people around as there is no sound made by them. This gives us the clue it is an isolated place, far from any crowded settlement.
The line that mentioned author passed through the “singularly dreary tract of country” tells us it is in the empty, depressing countryside that has a gloomy aura. There is no mention of people or anyone around, no mention of other buildings. The passage suggests, therefore, the place is detached from the cluster, unusual and lifeless.