http://tvtropes.org/pmwiki/pmwiki.php/Fanfic/AnywayIveBeenThere

Anyway, I've Been There Is a Gravity Falls fanfic by Caleb Nova

After leaving Gravity Falls, Dipper and Mabel soon realize that the weirdness that defined Gravity Falls has followed them back home. Things become more complicated when a former enemy reaches out to the twins for help in dealing with a dangerous new anomaly.

Anyway I've been there is broken up into two parts. Part 1 (titled Anyway, I've Been There) takes place during the school year following the end of the show. Part 2 (Titled New Summer Season) takes place during the following summer.

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