Subject-verb inversion after place adverbials

When an adverb or an adverbial expression of place comes in the initial position (at the beginning of the sentence), the subject and verb are inverted:

Down the hill rolled the children.
Round the corner was a nice café.

This is a rhetorical device used mainly in formal and literary styles; however, it may also occur in everyday conversation:

Here comes the bus.
There goes Sally.
Here's my number.

But if the subject is a personal pronoun, there is no inversion:

Here it comes.
There she goes.
Here it is.