This is the best place to start: Apocalyptic beliefs - A summary
Francis Danby, "The Opening of the Sixth Seal"
Apocalyptic themes begin to appear in the Old Testament (Hebrew Bible), before spreading into other Jewish literature and Christian writings in the New Testament and elsewhere:
John the Baptist, apocalyptic literature and the Day of Yahweh
Apocalyptic literature in the Old Testament
Apocalyptic literature in the New Testament
Themes in apocryphal apocalyptic writings
One major theme of such writings is the coming of supernatural figures of good and evil, such as the Messiah and the Antichrist:
The Messiah and the Son of Man
The Antichrist
It will be apparent that much of my writing is about the Judaeo-Christian tradition, but it takes in the beliefs of other religious and secular belief systems too:
The messiah and the apocalypse outside Judaism and Christianity
The lost Golden Age