Universal were planning to create a Shared Universe of it's classic monsters including Frankenstein, Dracula, The Wolf Man, The Invisible Man, The Mummy, Bride Of Frankenstein and The Creature From The Black Lagoon...
'Dracula Untold' was originally to be the first film in this universe but was removed, making the 2017 Mummy reboot the first film in the new universe. Unfortunately The Mummy was not a big enough success and the plans for the Dark Universe stalled.
However, an Easter Egg links this new film to the old Mummy/Scorpion King franchise. This list presents the films in chronological viewing order...