Revelation divides into Seven Sevens.

The Seven Churches, chapter 2:14-22.
The Seven Seals, chapter 6:1-chapter 8:5.
The Seven Trumpets, chapter 8:7-chapter 11:19.
The Seven Personages, chapter 12:1-chapter 13:18.
The Seven Vials, chapter 15:1-chapter 16:21.
The Seven Dooms, chapter 17:1-chapter 20:15.
The Seven New Things, chapter 21:1-chapter 22:5