a journey back to your childhood 
(ROOT (NP (NP (DT a) (NN journey)) (ADVP (RB back) (PP (IN to) (NP (PRP$ your) (NN childhood))))))
(ROOT (NP (NP (DT ) (NN )) (ADVP (RB ) (PP (IN ) (NP (PRP$ ) (NN ))))))