The Most Luxurious Speakeasy in the World, is of course in Paris! at the Shangri-la Hotel

The Le Bar a Ciel Ouvert is a summer, secret bar that only serves Krug Champagne and a few nibbles like center-cut smoked Salmon.

Open only in the summer from 6pm to 11pm, the bar ( housed in a private room with a terrace)   over looks the Eiffel Tower. 
The best time to come in around 8pm to see the Tower light up ( every hour on the hour) for 10 minutes.

Room holds  only 16 people on the terrace.

Reservations are a must in advance and you'll be given a password ( a la the 1920's) 

Stop at the hotel check in desk, give them the secret code and you'll be escorted to the private room.

A glass of Krug champagne starts at Euro 55 a glass and up..Expect to spend about Euro 300 for your stay.