https://joy.videvo.net/videvo_files/video/free/2019-02/large_watermarked/181015_Extra_Bulgaria_003_preview.mp4 Ruins in Serdica Square in Sofia Tracking away from a ruined Roman wall in the underground display area of Serdica Square in Sofia, Bulgaria. archaeologyarcheologicalarchitecturalarchitecturebalkansbulgariadisplaydomeexcavationglassmuseumromanruinruinsserdicaserdica squaresofiawall