Drainage tunnels under Vickery St. -  This was one of the last spots Dani and I explored before we started photographing our adventures.  Unfortunately, this was something of an aborted mission.  This tunnel runs in two parts: The first stretch goes beneath Vickery to an area alongside the interstate (I can't recall which one at the moment; maybe I-20?).  It then opens out and immediately starts back up again just a few feet later, going much further until it empties into the Trinity River.

What caused us to abort the exploration was that some homeless people live in this "valley" between the parts of the tunnel (though not actually in the tunnels).  We heard them talking outside of the tunnel, so we proceeded quietly to the end.  They did not spot us, so we doubled back before we were discovered.  Granted, there is probably no reason to fear all homeless people, but this was a secluded area, completely out of sight of the nearby roads, so we were not going to take any chances.

These people still live in this area, and in fact, you can just barely see their encampment from the on-ramp of the interstate (or, presumably, if you stop your car, get out, and lean over the railing).  They are firmly ensconced in this spot with a tent, clothes line, and lawn furniture.  No kidding!  Until such time as they vacate the spot, this site will likely remain unphotographed.

 
Tunnel from the bank to Elm St. -  This is another smaller tunnel that runs for perhaps a quarter mile or so.  It is a bit of a back-breaker, but is probably worth the trip if you (like we) have explored everything else in town!  GPS coordinates: Tunnel begins at 33.21369N, -97.13584W and ends at 33.21230N, -97.13504W.

 
The old LSU racquet ball courts-  Next to the original swimming pool on campus (i.e., not the rec center) are a set of abandoned racquet ball courts.  These are colossal concrete structures that are tucked away in a forgotten corner of the campus.  You will likely only stumble across these by accident, through sheer determination, or a happy combination of the two.

These courts have tremendous reverb, and I used to bring a guitar out to them periodically late at night.  Even an unplugged electric guitar sounds incredible.  Of course, you can't speak to a person standing 10 feet from you until you wait for the diffused sound to dissipate.

The courts had some interesting bits of graffiti when I last visited them (~'99), but they may have changed in the interim.

 
Boiler rooms in the SLU music building -  When I was a student a SLU, my roommate and I (aka "The Tunnel Rats") and some other friends used to spend all our spare time looking down gratings.  It turned out that there was a large grate behind the music building that was accessible.  Once it was removed, we climbed about 15 ft down a ladder into a part of the boiler room.  Still more of the boiler room continued beyond, then opened into the music building.  Of course, since this was after hours, we didn't proceed any further for fear of setting off any alarms.

Assorted rooftops -  Here again a lack of additional tunnels lead us to new extremes; this time we went as far above ground as we could rather than below!  This meant finding access to rooftops around the campus including (but not limited to) our dorm's roof, the top of the math/computer science building, and the Student Union (the latter thanks to some temporary scaffolding during a renovation).

Skull Creek -  It might be streching things to call this urban exploration, but back when I was at Southeastern there was a "subdivision that never was."  We had many adventures there, and I finally got around to recounting some of the highlights in a journal entry on the topic over here.

 
Drainage tunnel next to my old apartment complex -  This wasn't an especially thrilling tunnel, but it wasn't a very large town either.  The tunnel drained all the neighborhoods around my apartment, then emptied into a small creek that ran into the woods.  Remarkably, they actually had a grate over the culverts to prevent access.  What, I can't bring a wrench?  Naturally, I replaced the grate when I was finished checking out the tunnel.

 
Saint Scholastica abandoned dorms -  These dorms belonged to a private Catholic school for girls.  Originally, back when the area was less populated, this was boarding school.  As the area developed, there were enough residents keep the place in business from just the surrounding neighborhoods.  The dorms were abandoned, then fell into disrepair.  They were fenced off, and the property was completely overgrown after some time had passed.  Of course, there was a convenient hole in the fence, and I visited the place perhaps a dozen or so times over the years.

These were absolutely terrific abandonments by all the UrbEx standards.  The particle board ceiling tiles were eaten away by mold, graffiti covered the walls, sections were collapsing, but the whole place was basically hidden away so you could spend hours exploring... or, say, making out with your then-girlfriend ;-).

Unfortunately, the dorms were demolished some years back and the land completely cleared.  New buildings belonging to the school now sit on the spot. 

 
N.O. Convention Center rooftop, maintenance passages, etc. -  When I went to the Society for Neuroscience conference last November, I couldn't resist poking around between sessions.  There are miles (no exaggeration!) of passages for catering, custodians, etc.  I didn't have time to do much exploring in general, but one area I happened across while looking for a shortcut was definitely worth it. 

I went out the back of a large auditorium up by the projectionist a/v booth.  This is actually not a real exit.  Generally people come in from the sides close to the stage and in the middle of the auditorium.  However, there was an Exit sign and I was in a hurry to get to another session.  That door lead to a maintenance stairwell (i.e., dusty, concrete, etc.; all in contrast to the carpeted areas attendees usually see).  I didn't have the time to explore it from top to bottom, but there was a door left slightly ajar that led to the rooftop.  Of course, this is right in downtown New Orleans, so I was a little hesitant to be out in the open in broad daylight, but I have to admit that I did go out for just a bit.

The rest of the stairwell that I did explore was noteworthy in that it could not be entered from elsewhere without a key, only exited.  The access point I discovered was just a unique spot that probably was not always open (especially if the management reads this!).

For more information about this huge facility, check out this link.