Leaning at 5 degrees. 200 ft tall. Built by 3 different architects, starting in 1173. Soil is marshy and although it began leaning right away, they continued construction to the 4th floor. It sat half finished for over a century, at which time another architect worked to correct it by angling the next 3 stories backward. Another century passed, another architect put the belfry on the top, again leaning it backwards. Millions have been spent on repairs to the soil (600 tons of lead placed on the leaning side). After sucking out 60 tons of soil on the opposite side, it was straightened by 6 inches and seems to have stabilized. Some think it doesn't look much different. Anyone for a climb?