Valmiki Ramayana Sundara Kanda Sarga 58 Shloka 155

ततः then, अहम् I, वेगेन quickly, तत् that, नगरद्वारम् gate of the city, आप्लुतवान् leapt, अहम् I, असंभ्रान्तः not perplexed, युगान्ताग्निः fire at the end of the dissolution, प्रजाः इव like the world, साट्टप्राकारगोपुराम् boundaries and towering mansions, तां पुरीम् of the city, प्रदीप्तेन by fire, पुच्चेन by the tail, दहामि burnt away.

"Then I leaped to the entrance gate of the city without being perplexed. With my burning tail I set fire to the boundaries and towering mansions which looked like the world at the end of dissolution.