Absinthe has become increasingly available in the U.S. in recent years and is now a fixture at a number of tony cocktail bars. We're all for this – the Sazerac being one of our favorite drinks – but the FDA still insists on regulating thujone, the chemical credited with the drink's mind-bending properties. No absinthe sold in America contains more than 10 milligrams a liter of thujone, famously a derivative of the wormwood plant. This is why true connoisseurs of the green fairy who are unsatisfied with domestic options head to the Czech Republic, where wormwood-infused spirits are available with up to 100 milligrams of thujone per liter. The classic place to sip: Prague. Look for Bairnsfather and King of Spirits, two brands that offer particularly powerful tipples and enjoy an evening wandering around the main square in a pleasant haze. Say hi to Kafka when you see him.