What is the ruling on a woman praying in a place where men pass by and look at her?

It is Sunnah for a woman to pray in the most secluded place she can find, due to the Prophet, peace and blessings be upon him, saying: "A woman's prayer in her house is better than her prayer in her chamber, and her prayer in her private recess (makhda') is better than her prayer in her house," and his saying: "Indeed, the most beloved prayer to Allah that a woman offers is when she prays in the darkest place in her house." Nevertheless, if she prays in another place and covers what must be covered, her prayer is valid and she does not need to repeat it, even if men see her during her prayer.