Seeing the top sights might be enough for other cities, but Sigmund Freud's hometown demands further exploration.
Like a waking dream, Vienna stimulates all three parts of the human psyche Freud identified: the hyper-analytical superego, the imaginative ego, and the hedonistic id. Get up off the couch, book a ticket and let your unconscious be your guide.
Superego
In Vienna, even those who fundamentally disagree with Freud