Top Reddit comment:

There's a similar concept bar in NYC called Please Don't Tell.

Please Don't Tell is hidden through a secret wall in a phone booth. However, that phone booth is indoors, within a Hot Dog shop.

For PDT, you pick up the phone and they will answer, only opening up the door if you have a reserved spot waiting or there happens to be room. Seems like you may just be able to walk in to OP's spot.

Please Don't Tell is one of many speakeasies in New York City. Other popular spots include Death + Company, The Back Room, and Angel's Share.

Reddit comments: 

http://reddit.com/r/pics/comments/2skhu0/a_bar_hidden_behind_an_old_cocacola_machine_in/