Unmarked doors are a downtown Bentonville convention, and Callisto plays it to the hilt. Inside The Midnight Gallery, a painting opens onto a tropical room the street gives no sign of. Treat the entrance as theater, because the bar does — the secret is published, and the place books openly. What the door is actually protecting is the program: a tiki list running past thirty cocktails, every juice fresh-squeezed and every syrup made in house, with tiki-inspired plates alongside. That from-scratch glass is what Axios named it Bentonville's top cocktail bar for. Walk-ins are welcome; reserve if you want the painting to open on schedule.