Update: The roundhouse was demolished at some point after these photos were taken but before January of 2020.
I tend to think of ruins as static beings, immutable and staying the same for decades. This obviously is far from the truth; abandoned buildings are in a constant state of kinetic change, as a recent visit to the roundhouse in East St. Louis illustrates.
What had once been a still intact roof in November came crashing down in the last six months or so, proving that these buildings are still very much alive and changing.
Even ancient Roman monuments are not safe from change; a week after visiting the Baths of Caracalla, the giant structure was damaged by an earthquake.