Destroying unfinished buildings, leaves them in queue.
I've created a building, but due to lack of resources, the building was not being built. I canceled it, the building went through "tearing down", but is still left in my building queue. It doesn't have an "X" to cancel its build, and its taking up one slot.
As a side note. The buildings in queue should move up automatically, skipping the ones that are lacking resources to be built. It is really annoying to manually move building over the ones that are lacking resources in the building queue.