This tomb in Damascus belongs to Abu Darda (may Allah be pleased with him), an eminent companion of the Prophet (peace and blessings of Allah be on him). 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 (Glorified and Exalted is He)