Kaufmannshöfe of Flensburg
Flensburg’s Kaufmannshöfe (Merchants' Courtyards) date from the 18th century, when Danish-ruled Flensburg provided supplies to the Danish West Indies (St Thomas, St Jan and St Croix) in exchange for sugar and rum. Designed to make it easier to load goods into ships, the Kaufmannshöfe typically consisted of a tall warehouse on the harbourside, behind which were a series of low workshops, wrapped around a central courtyard and leading to the merchants' living quarters. You can catch glimpses of many of these through covered alleyways off Grosse Strasse.
Free town maps from the tourist office mark nearly every hof (courtyard).