My daughter chose Mission San Francisco de Asis, commonly referred to as Mission Dolores.
She initially started her project using a cardboard box and had it cut to size, but decided shortly after to sew her mission using felt and plastic canvas instead (the plastic canvas is used to reinforce the walls/bottom/roof). The idea came from the fabric beach cottage we made years ago (photos are early on in my flickr stream).
She traced the box's sides onto freezer paper and cut out the freezer paper templates, which I then ironed onto felt. She would then cut the felt and plastic canvas pieces accordingly. She did all the sewing herself. I helped with threading needles, tying or untangling knots, ironing templates, pinning where necessary (to make sewing easier), and giving a bit of advice when asked (what stitches to use where - blanket/running/whipstitch, etc.).
I advised her to make all her smaller templates for windows, doors, altars, etc., out of freezer paper first - just to test the size and placement ahead of time. This helped her plan the layout of each section. When satisfied, she would hand the freezer paper templates to me, I'd iron them onto felt, and she'd cut them out and start sewing. It worked out really well.
She whipstitched felt around various sized crayons to create the columns on the front of the Mission. Crayons were especially easy to cut to size! The rest of the front (steps, etc.) are blocks of styrofoam covered with felt.
That is the cemetery to the side. Those are the names of some people actually buried there.
The left wall drops down and also shows a cemetery scene, shown above. It looks especially gloomy with some dark clouds overhead :-).
The roof flips open and actually comes off completely to reveal the inside of the Mission.
The roof of Mission Dolores depicts original Ohlone Indian designs - which she chose to represent using this Halloween chevron fabric. (Link here shows a great photo of the actual ceiling).
She chose to show two of the altars - the front and right side.
And that right there is the grave of (one of) my 6th and her 7th Great Grandfather. His is one of four tombs buried inside the Mission itself.
One down...two more to go ;-).