In a dream, weeping over a familiar dwelling or person indicates the continuation of the state one is in and long life. It may indicate an increase in affirming God's Oneness, if he remembers God Almighty, glorifies Him or declares that there is no god but God, because that is most of what is said upon seeing ruins and remains. If he slaps his face or weeps intensely, it indicates miseries and worries from whoever those remains represent.
Dream meaning · al-Nabulsi
Weeping (over familiar places) بكاء
Source: al-Nabulsi, Ta'tir al-Anam fi Ta'bir al-Manam, p. 39. English translation by iDreamBot. Quran verses: Quran.com, Saheeh International.