Round Corner Cantina in Pittsburgh, PA has a house sangria that is the best I've ever had. Signature cocktails are not really the thing at a ton of bars around here (I'm in between Cleveland and Pittsburgh). People usually create signature drinks for events, like weddings or fundraisers. Basically, we like what we like here and it just seems to be our mission, as a drinker, to find wherever makes the best. The Rust Belt is not known for trendiness. A signature drink is probably too hip of a concept for a bar around here to really care about outside city limits particularly.