The Great Mosque of Baalbek in Lebanon is an Umayyad
mosque dating back to about 140 AH. (Some claim it could be as
much as 60 years later) It has suffered from deterioration due
to dampness, salt, and structural degradation. The last renovation
was conducted with special attention to archaeological remains,
as it is believed that the mosque may have been built upon several
older structures dating back to antiquity. Lime mortar and traditional
materials were used to preserve the buildings character.
As you can see in the photo, the Baalbek Mosque (to the
right of the main Baalbek ruins) has an orientation directly
between Petra and Mecca.
You can learn more about this mosque at: http://archnet.org/sites/4421