"Right off the check-in area, Vesper is the Cosmopolitan’s ever-reliable, always-open lobby bar. With mirrored ceilings and boldly patterned carpet, the setting nods to a retro Vegas vibe — and the drinks follow suit. Choose from a list split between “classic” and “reimagined” cocktails, like the namesake Vesper martini or the inventive Desert Island, made with Rayu mezcal, sherry, curaçao, and lime." - Jennifer Smith