This tomb in Damascus belongs to Abu Darda (may Allah be pleased with him), an eminent companion of the Prophet (ﷺ). His wife Umm al-Darda is also buried close to him.
The entrance to the tomb:
Note that this entry has been shown for information purposes only. On no account should anybody pray towards a grave or seek supplication through them as this is tantamount to committing shirk, associating partners with Allah (ﷻ)