Past Civilizations and Ruins

أَفَلَمْ يَهْدِ لَهُمْ كَمْ أَهْلَكْنَا قَبْلَهُم مِّنَ ٱلْقُرُونِ يَمْشُونَ فِى مَسَـٰكِنِهِمْ ۗ إِنَّ فِى ذَٰلِكَ لَـَٔايَـٰتٍ لِّأُو۟لِى ٱلنُّهَىٰ

Then, has it not become clear to them how many generations We destroyed before them as they walk among their dwellings? Indeed in that are signs for those of intelligence.