What is apocalyptic literature, and how is it often misread?

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What is apocalyptic literature, and how is it often misread? In your answer cite at least two examples of how the book of Revelation uses the conventions of the genre apocalyptic literature.  What happened in 66 AD in Judea, and why is it important?  Where are the 7 cities of Asia today (what country)? What are the common themes in the messages to the churches in the early chapters of Revelation?