Walking through the canal district of central Amsterdam can be disorienting to all your senses. The cobbled streets and sidewalks are narrow and filled with what seems an endless stream of bicycles, mobile and stationary. The 17th century-era row houses lining the canals are all similar in style and color — three stories tall and nestled tightly together as far as the eye can see. Every block looks similar to the prior block, austere but beautiful. It’s only thanks to Google Maps that we’ve located a particularly important address, a major epicenter of the rum world. From the street, though, it appears like any other nicely appointed Dutch residence; it’s only sign of what’s inside is a small polished brass plate under the doorbell Mrs. Wonk and I have found our way here on this February morning to visit the inner sanctum of E&A Scheer—a serious heavy hitter in the worldwide rum business, but one you’ve likely never heard of.