All the Courier wanted to do was go into the vault and loot some guns instead. She was stuck watching over twins who had no idea where they were. She'll try to get them back home and try not to get into any weird adventures. (might change the rating)

Major AU! Dipper pines discovers a vault under modern day Piedmont and is opened to a whole new world...which is only topped by what he later finds in Gravity Falls! (continued in 'Tales of the falls')

this is a AU where the bombs dropped which destroys the world, but not humanity, 200 years later at a underground bunker, Mable and Ford shall face dangers that lurks in the wastelands, could they survive? (disclaimer: I don't own Gravity Falls or Fallout)

Vault 618 was funded by Nathaniel Northwest and populated with the world's most brilliant minds. When the world was ravaged by the Great War it would be more than two hundred years before the Vault door opened. This is the story of the Twin heroes and how they uncovered a great and terrible secret of their Vault and its past. (Rated T for violence and some mild language.)