By the way, I love all the masonry. I've never seen ceilings like that, and the fireplace is gorgeous. Again, I'm super jealous of your house...
The ceiling is called a "techo de bóveda" or arched roof. They're extremely common in this part of Mexico and can be seen in buildings of all types. Practically all buildings except modern high-rises and some warehouses are made of masonry, and they have it down to an art form. Check out the interior of
this church in Tapalpa, a little mountain village not too far from Guadalajara. One of my favorite places to get away for a weekend.
EDIT:
another shot