After World War Two there were hundreds of Army bases all over the world that were essentially abandoned.
Buildings that once were so clean you could eat off of the floor were suddenly left to the mercy of the elements.
Warehouses, motor pools, barracks all just sat there, unattended, often even unguarded.
Many were in far off parts of the world. Many of those in the USA were in remote regions of the American South West, or Alaska. Hardly a place for tourists or scavengers. The buildings just sat there, build as temporary war emergency structures, they were never intended to last more than a few years.