Gravity Falls Forest

The Gravity Falls Forest was a forest which contained the Mystery Shack.

History
When the Tenth Doctor and Rose Tyler flew the TARDIS "further than [they'd] ever gone before", it flew through the forest and crashed through the roof of the Mystery Shack before flying inside. (TV: )

Behind the scenes
The forest, covering most of Gravity Falls in the series and unnamed in the above promotional video, is the main setting of Gravity Falls.