Apocalypse (Greek: Ἀποκάλυψις Apokálypsis; "lifting of the veil"), is a term applied to the disclosure to certain privileged persons of something hidden from the majority of humankind. Today the term is often used to refer to the end of the world, which may be a shortening of the phrase apokalupsis eschaton which literally means "revelation at the end of the æon, or age".
St. John at Patmos - Pine panel; Alte Pinakothek at Munich
 - Photo by Carol Gerten-Jackson
Hans Burgkmair the Elder (1473-1531)
Found Here: http://en.wikipedia.org/wiki/Image:St-john.jpg