I love all the album! But my favourite songs are "Welcome to NY", "Blank Space", "Bad Blood" and "I KNOW PLACES" (that is my favourite one!). I love "I Know Places" for the lyrics, I mean, the verse "Baby I know places we won't be found [...] I know places we can hide...". For me it's like being in a secret relationship ;) so I can be with my special one and no one will know where we are xD