Open research question
Can the precise location of the former Tsarichina military excavation be independently verified by comparing contemporary site photographs with modern maps, satellite imagery, and Bulgarian records?
A source, research note, or further-reading link closes this question when staff accept it. Evidence and corrections stay attached for staff and do not close it by themselves.
Staff review every contribution before it is added to the file. A correction is a proposal: accepting it does not replace the official record. Rejected items are handled like rejected case submissions.