The Gravity Falls Museum of History is a museum detailing the history of the town of Gravity Falls. It shows various statue pieces from throughout the town's history, and has free admission on Pioneer Day (The workers also give out free balloons on that day).
During Pioneer Day, Dipper and Mabel follow a mysterious map found inside of book 3 to the museum, hoping they would find who the true founder of Gravity Falls was. There, they find a strange piece of abstract art that is the same shape as a picture on the map. Not knowing what to make of it, Mabel lays upside down on the bench in front of it. She then realizes that the piece is actually a statue of an angel pointing upside down, pointing towards the town's cemetery, where an identical statue stands.
- 108. "Irrational Treasure"