Syria
With your back to the south entrance of the Umayyad Mosque, walk down the small souk facing you. It's the old Gold Souk, aka souk Al Sagha. Look for a sign to "Papa Joseph's", an antique knick-knack shop on the right-hand side above a perfume shop, and follow the narrow stairs all the way up to the shop. From outside the shop, you can look over the lane into partly-excavated Roman baths not seen from street level. The shop keepers keep their generators in the enclave, but it is still easy to see how the Romans built beautiful baths for the brief time the Umayyad Mosque was a church.
Souq Assagha, just off Souq Al Hamidiyeh
Google map: bit.ly/a8cLU1
Even if it's a Friday and the souks - in whichever country - are closed, it's worth wandering around them to appreciate their architecture. The bustle of shoppers and shopkeepers often means that it's hard to see interesting details. In Damascus, where the souks are not closed off when the shops are shut on Fridays, walkers can glimpse fragments of tiles, amazing ceilings, and shop signs not easy to spot on other days.
Google map: bit.ly/a8cLU1
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