"Flying Buttresses" is quest 9 out of 10 which you get from George during the "Skippy's New Place" quest line.
Tasks[]
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Have 1 Cathedral with a full crew. Ask your friends to crew your Cathedral Also friends can apply for your crew when they visit your kingdom |
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Collect tax on the Cathedral. Click on the Cathedral to tax it |
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Craft 8 Grape Juice. Grape Juice can be crafted in the Kitchen. |
Reward[]
For completing this quest you will get 
???? Coins and 
???? XP, as well as . You will then be able to start the Skippy Takes Position quest.