This is the 15773rd most frequent Polish word.
szybach
"Windows" (specifically, glass panes in windows).
Here, 'szybach' is the locative plural form of 'szyba', meaning it indicates the location (the windows).
Spoglądam na krople deszczu na szybach.
I look at the raindrops on the windows.
In this sentence, 'szybach' also takes the locative plural form, referring to the location of the reflections.
W starych szybach widać odbicie przeszłości.
In the old glass panes, one can see the reflection of the past.
'Szybach' again is the locative plural form, here specifying the location of 'mgła' (fog).