Nice idea for a thread. I'll add some more:

-King Cole Bar at the St Regis in NYC - very cool Max Parrish mural
-Beach Bar at the W San Diego downtown - on the second floor with a sand floor and cabanas
-Eiffel Tower Bar at Paris, Las Vegas - great views of the strip
-Bar at the Ladera Resort, St Lucia - sitting outside with a bottle of Caribe overlooking the Pitons
-Carousel Bar at the Hotel Monteleone in New Orleans - brings new meaning to 'one more round'
-St-Laurent Bar at the Fairmont le Chateau Frontenac in Quebec City - excellent terrace with views of the St Lawrence
-Round Robin at the Willard in DC - original home of lobbyists and one of the power bars in the US capital.