Here's a great paper model of an old rickety stone barn.
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This paper model of a brick warehouse should be useful in a variety of miniature wargames, from the late 19th century to modern times.
Here's a paper model of a Rickshaw. It is well done, and would be useful in a variety of asian settings.
Here's a paper model of an ancient Central American style temple, just ripe for sacrifices. I think it would be terrific for a pulp action game.
On Deviant Art, Madun Two Swords offers a selection of paper models of a medieval town.