Twin siblings Dipper and Mabel Pines spend the summer at their great-uncle's tourist trap in the enigmatic Gravity Falls, Oregon.Twin siblings Dipper and Mabel Pines spend the summer at their great-uncle's tourist trap in the enigmatic Gravity Falls, Oregon.Twin siblings Dipper and Mabel Pines spend the summer at their great-uncle's tourist trap in the enigmatic Gravity Falls, Oregon.