The Bar/Lounge at Fairmont Pittsburgh
The bar/lounge at Fairmont Pittsburgh is recommended by professional travelers. Out of 2 reviews that we monitored, 2 mentioned the bar/lounge, like Gayot and Star Service.
Fairmont Pittsburgh 
Gayot
Star Service
Gayot "This bar also displays artifacts discovered during the excavation of the building, including porcelain lithophanes from the mid-1800s"
Star Service "The Fairmont in Pittsburgh has raised the bar, creating the watermark for modern lodging"
