Check out the San Miguel scene, it has almost eight million triangles. If that's not a complex scene, I don't know what is. You can find it on this page, along with other nice models (for instance, if San Miguel is too much, you can use Crytek's remake of Sponza, which has a more manageable ~262k triangles, or the famous conference room scene with 331k triangles).
They are all in .obj format with all textures and materials attached, I believe, so parsing shouldn't be a problem.
“If I understand the standard right it is legal and safe to do this but the resulting value could be anything.”