Nearly impossible to find on the Bellagio casino floor, romantic speakeasy the Vault is worth hunting down, especially for its ultra dreamy espresso martini. Served in a wide glass with an impossibly delicate stem, the Seductress is a combination of bourbon cask-aged rum, cognac, espresso, and banana, all topped with creamy sesame froth and a toasted garnish. Ask for a spoon to scoop up the cream left behind, then order another round to soak in the luxe black marble bar and alcove booths housing Las Vegas’s finest.