Rightly "The monuments of Syria" by Ross Burns states "The street facade is exceptionally dull". It goes on explaining how the interior is worth inspection. I would have gladly obliged, but: closed.

Oh, this is the Hanbali Mosque up a side street built between 1202 and 1213 for the Hanbalis of Damascus.

From the Enc. Britt.: "the most fundamentalist of the four Sunnî schools of religious law. Based on the teachings of Aḥmad ibn Ḥanbal (780–855), the Ḥanbalî legal school (madhhab) emphasized virtually complete dependence on the divine in the establishment of legal theory and rejected personal opinion (raʾy), analogy (qiyâs), and the Hellenistic dogma of the Muʿtazilah school of theology, on the grounds that human speculation is likely to introduce sinful innovations (bidʿah). The school thus relied solely on a literal reading of the Qurʾân and Ḥadîth (narratives relating to the Prophet's life and sayings) in formulating legal decisions. Popular in Iraq and Syria until the 14th century, the traditionalist Ḥanbalî legal approach was revived in the 18th century through the teachings of Ibn Taymîyah (1263–1328) in the Wahhâbîyah movement of central Arabia. This madhhab has since become the official legal school of 20th-century Saudi Arabia."