The 650+ images in this album depict all the main events of Revelation. The images are organized in order of appearance, beginning with St. John in Patmos (chapter 1) and ending with the final benediction in chapter 22.
Images depicting events of Revelation are easier to understand if you've read chapter 4 where all the creatures in heaven's throne room are described. The Seraphim are especially popular with ancient artists, and are usually shown around the throne of heaven.