Found your post through @insight-out entry post in the pay it forward contest this week.

This is so awesome @varya-davydova, I think most tourists pass on this pavement but never saw any story or people taking pictures at this pavement. I think hungary hadn't produces this kind of paving block anymore..wonder how they sent it from hungary to sofia at that time.

Thank you for sharing this, some people might think it is made from golden, wonderful.. it still shining through your photo above.