I need medium/large maps (in Quake map format/MAX/3DS files) to test some algorithms. Does anybody know where one could download some? Large quake maps would be perfect! Also, big architectural models would be good too. Thanks!

If you want .map files, go to this page and download Quake Rally leftovers. It's got 4 .map files in. The downside is only one of them seems to be a properly sealed map (start.map), at least according to the tools I'm developing at the moment. AirQuake also came with some .map files. AirCity took all night to compile on my old P133, but that was mostly visibility/lighting calculations I think.