Amsterdam's charmingly old buildings are often tall and narrow. They're nearly always intentionally wonky. At first I thought they would soon topple forward however I learned the lean is for a reason. With steep and narrow staircases it's impossible to get large and heavy goods inside. By sloping the buildings forward and building a giant hook and pulley facing outwards at the top, big items can be hoisted up and inside via a window. The lean minimises facade damage.