Valmiki Ramayana Yuddha Kanda Sarga 39 Shloka 21
Original Shlokaसापुरीगोपुरैरुच्चैःपाण्डुराम्बुदसन्निभैः । काञ्चनेनचशालेनराजतेनचशोभते ।।6.39.21।।
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सा that, पुरी city, उच्चैः tall, पाण्डुराम्बुदसन्निभैः like white cluster of clouds, गोपुरैः towers, काञ्चनेन with gold, राजतेनच and silver, शालेन fortified, शोभते charming.
The city of Lanka looked charming with tall towers resembling white cluster of clouds fortified with gold and silver.