Agence Eureka on Flickr. It's definitely a daunting set-up. There are 1434 images in the set. And you'll have to do exactly what I did: spend a very long weekend afternoon picking through every damn one of them. But, if you're looking for a vintage paper theatre, or a vintage paper carousel, or a vintage paper car, or a vintage paper dollhouse....well, it really is totally, totally worth it, because this chick's got some insanely rad stuff available. And there's a bunch of different kinds of, for example, theatres. There are really simple ones that don't take any actual building, all the way to really complicated ones that can take a whole afternoon to put together. I'll re-post photos of a couple of the ones I've built:
And here's a direct link to a particular theatre that she put in a separate set. I have this one printed out and ready, but I haven't built it yet, so, sorry, no photo:
The Brittania Theatre, Featuring The Play "Ali Baba And The Forty Thieves"