Viva Voce does apply here. Babylon was still a city when Peter was preaching and writing from there. Many other references to Babylon like in Revelation it no longer is but is a symbol of the evil of Babylon. The RCC claims Peter was in Rome when clearly scripture states he was in the real city of Babylon in the region that Peter was known to be the apostle too.
It is the city ruling over the kings of the earth (Rev. Rev. 17:18);
It is descibed as sitting on seven mountains as does Rome (Rev. 17:9);
It is described as the center of the world’s merchandise (Rev. Rev. 18:2, Rev. 19:2); It is described as the persecutor of the saints (Rev. Rev. 17:6).
So you can't have it both ways; you can't say on one hand that Rome is the "Whore of Babylon" when it fits your agenda and then deny it is when it doesn't.
Peace be with you.
In 331 BC, Darius III was defeated by the forces of the Ancient Macedonian Greek ruler Alexander the Great at the Battle of Gaugamela, and in October, Babylon fell to the young conqueror. A native account of this invasion notes a ruling by Alexander not to enter the homes of its inhabitants.[20]
Under Alexander, Babylon again flourished as a centre of learning and commerce. But following Alexander's death in 323 BC in the palace of Nebuchadnezzar, his empire was divided amongst his generals, and decades of fighting soon began, with Babylon once again caught in the middle.
The constant turmoil virtually emptied the city of Babylon. A tablet dated 275 BC states that the inhabitants of Babylon were transported to Seleucia, where a palace was built, as well as a temple given the ancient name of Esagila. With this deportation, the history of Babylon comes practically to an end, though more than a century later, it was found that sacrifices were still performed in its old sanctuary.[21] By 141 BC, when the Parthian Empire took over the region, Babylon was in complete desolation and obscurity.
http://en.wikipedia.org/wiki/Babylon
Jeremiah 51:37
Babylon will become a heap of rubble, haunted by jackals. It will be an object of horror and contempt, without a single person living there.
Persian Empire period
Under the Parthian, and later, Sassanid Persians, Babylon (like Assyria) remained a province of the Persian Empire for nine centuries, until after 650 AD. It continued to have its own culture and people, who spoke varieties of Aramaic, and who continued to refer to their homeland as Babylon. Some examples of their cultural products are often found in the Babylonian Talmud, the Gnostic Mandaean religion, Eastern Rite Christianity and the religion of the prophet Mani. Christianity came to Mesopotamia in the 1st and 2nd centuries AD, and Babylon was the seat of a Bishop of the Church of the East until well after the Arab/Islamic conquest.