Not sure where this should go, but this IS general, and i like it here more than ace-spades.com. Anyway, we had a babel match on the holes map and the other team built this.
Sorry for the bad shot, but the bottom half of the tower was solid through and connected to 2 different bases. I managed to dig into it and use babel's retarded anti-grief rules to start destroying it, but they won before i could finish.
On topic: That's a really good babel tower! Probably the most effective (and colorful) I've seen so far. Although an smg to the top part would temporarily disable it long enough to get the hole thing down, that is if only a few people are working on the tower.
The best one that I have ever seen (no pics though) was just a bunch of massive tower going straight up and had tons of confusing and different ways to get to the top so that if one fell, we would still have like 20 ways up and we wouldn't even lose all the ones that were on the other tower (the initial builder was a genius).