Krṣṇa Erects the Dvārakā Fort
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by Kālayavana. He therefore thought it wise to take precautionary measures to defend the strategic points of Mathurā. If both Krṣṇa and Balarāma were engaged in fighting with Kālayavana at one place, Jarāsandha might come at another place to attack the whole Yadu family and take his revenge. Jarāsandha was very powerful, and having been defeated seventeen times, he might vengefully kill the members of the Yadu family or arrest them and take them to his kingdom. Krṣṇa therefore decided to construct a formidable fort in a place where no two-legged animal, either man or demon, could enter. He decided to keep His relatives there so that He would then be free to fight with the enemy. It appears that formerly Dvārakā was also part of the kingdom of Mathurā, because in the  Śrīmad-Bhāgavatam  it is stated that Krṣṇa constructed a fort in the midst of the sea. Remnants of the fort which Krṣṇa constructed are still existing on the Bay of Dvārakā.
He first of all constructed a very strong wall covering ninety-six square miles, and the wall itself was within the sea. It was certainly wonderful and was planned and constructed by Viśvakarmā. No ordinary architect could construct such a fort within the sea, but an architect like Viśvakarmā, who is considered to be the engineer among the demigods, can execute such wonderful craftmanship anywhere in any part of the universe. If huge planets can be floated in weightlessness in the outer space by the arrangement of the Supreme Personality of Godhead, surely the architectural construction of a fort within the sea covering a space of ninety-six square miles was not a very wonderful act.
It is stated in the  Śrīmad-Bhāgavatam  that this new, well-constructed city, developed within the sea, had regular planned roads, streets and lanes. Not only were there well-planned roads, trees and lanes, but there were well-planned paths and gardens filled with plants known as  kalpavrkṣas , or desire trees. These desire trees are not like the ordinary trees of the material world; the desire trees are found in the spiritual world. By Krṣṇa's supreme will, everything is possible, so such desire trees were planted in this city of Dvārakā constructed by Krṣṇa. The city was also filled with many palaces and  gopuras , or big gates. These  gopuras  are still found in some of the larger temples. They are very high and constructed with extreme artistic skill. Such palaces and gates held golden waterpots ( kalaśa ). These water pots on the gates or in the palaces are considered to be auspicious signs.
Almost all the palaces were skyscrapers. In each and every house there were big pots of gold and silver and grains stocked in underground rooms. And there were many golden waterpots within the rooms. The bedrooms were all bedecked with jewels, and the floors were mosiac pavements of