Leaning Tower Of Pisa

Trying to illustrate one building a week for a few weeks. This is The Leaning tower of Pisa in Italy. The tower's tilt began during construction in the 12th century, caused by an inadequate foundation on ground too soft on one side to properly support the structure's weight. The tilt increased in the decades before the structure was completed in the 14th century. It gradually increased until the structure was stabilized (and the tilt partially corrected) by efforts in the late 20th and early 21st centuries.

What building do you think I should do next?