The Leaning Buildings of Santos, Brazil

The coastline along the city of Santos, some 80 km from Sao Paulo, in Brazil, offers a strange sight. Like dominoes about to topple, the waterfront is lined by a string of high rise apartments that are unmistakably tilted to one side. The problem lies in Santos’ soil. Below a seven-meter layer of sand is a 30-40 meter deep bed of slippery clay that doesn't cope well with the weight of the structures.