RPG Resource of the Day: Foldup Paper Models

I love adding a 3-D element to my games.  A few years back we often used Dwarven Forge’s “polystone” pieces for 3-D dungeons.  I’ve also bought some of Fat Dragon Games’ foldup dungeon models.  But Wizards of the Coast published a “Map Folio 3-D” product a few years ago and it seems they released several more models on-line which are available for free.

Do you know of some other (especially free) 3-D paper foldup models?  Please post a link in a comment!