Duke Nukem 3D USER MAP this one is worth the download
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Title                   : Night City
Filename                : NITECITY.MAP
Author                  : KEITH WILLIAMS
Email Address           : NONE
Misc. Author Info       : Long Live Duke !

Description             : This is a level of a city with many buildings
                          that you might find in a city
                          it has 
                          - a moving car that will driveby your ass if you 
                            dont keep off the street you. can also ride in it
                          - a post office with an armory
                          - a sewer with lots of shit (literally)
                          - a bank with a secret room
                          - a hotel

Additional Credits to   : 100% keith made
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* Play Information *

Episode and Level #     : user level
Single Player           : no point to it but it's fun to walk around
DukeMatch Level         : Yes
Difficulty Settings     : Not implemented

* Construction *

Base                    : New level from scratch. You may do whatever
                          the hell you want with this
Editor(s) used          : Build
Known Bugs              : no known bugs