This is the 493rd most frequent Persian word.
شهرهای
"شهرهای" means "cities" in English.
In this sentence, 'شهرهای' means 'cities of', referring to cities in Iran.
شهرهای ایران بزرگ و زیبا هستند.
The cities of Iran are large and beautiful.
Here, 'شهرهای' indicates 'cities of', connected to 'friends' to show possession.
به شهرهای دوستانم سفر کردم.
I traveled to my friends' cities.
In this usage, 'شهرهای' refers to 'old cities', describing a type of cities.