In this episode of Religion Today, host Martin Tanner explains that the Book of Revelation is "apocalyptic" literature from the meaning to uncover or reveal, hence the English title, the Book of "Revelation."  Tanner explains tha basic meaning behine each chapter, including the Mark of the Beast, the Second Coming, how the City of Zion is like a giant cube, 1,500 miles wide and 1,500 miles high - big enoug for any person who wants to go in.