Valmiki Ramayana 1.43.18
व्यलोकयन्त ते तत्र गगनात् गाम् गताम् तदा ।विमानैः नगर आकारैः हयैः गज वरैः तथा॥
vyalokayanta te tatra gaganāt gām gatām tadā |vimānaiḥ nagara ākāraiḥ hayaiḥ gaja varaiḥ tathā ||
Our plain-language meaning of this verse is waiting for scholar review.
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