This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionChurch St Georg Rotunda IMG 0547.jpg
English: St Georg Rotunda Church is located inside the backyard of the presidential Palace of Bulgaria, with excavated parts of old Serdica. The Church is from early Middle Ages.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.