Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 52
Sanskrit:
तत: प्रविष्ट: सलिलं नभस्वताबलीयसैजद् बृहदूर्मिभूषणम् ।तत्राद्भुतं वै भवनं द्युमत्तमंभ्राजन्मणिस्तम्भसहस्रशोभितम् ॥ ५२ ॥
ITRANS:
tataḥ praviṣṭaḥ salilaṁ nabhasvatābalīyasaijad-bṛhad-ūrmi-bhūṣaṇamtatrādbhutaṁ vai bhavanaṁ dyumat-tamaṁ bhrājan-maṇi-stambha-sahasra-śobhitam
Translation:
From that region they entered a body of water resplendent with huge waves being churned by a mighty wind. Within that ocean Arjuna saw an amazing palace more radiant than anything he had ever seen before. Its beauty was enhanced by thousands of ornamental pillars bedecked with brilliant gems.