I'm never talking too much about other games running on the ID engines, there is so many to cover and I'm all alone for that. Just found this:
City Night is a total conversion/mod for Medal of honor, designed by the mCT (Medal of honor Conversion Team), reproducing a complete city with subway and drainage system, new weapons and much more. The mod got only one map called Genereal cobra. Take a look at the screenshots, it's worth it!
First one,
second and
third.