Please Don't Tell
While PDT is fairly well known, it still takes some attention to detail to make it into this hidden bar. The entrance is veiled by a phone booth within Crif Dogs. Enter the phone booth and Dial One. The hassle is worth it. Chase your drink with a hot dog from next door. There's typically a wait at prime hours so large groups should make a reservation in advance.
PDT, 113 St. Marks Place
[Photo via @dkisreal]