In July 2005 over 14 different LEGO groups gathered in Cincinnati Ohio for one huge LEGO display. I was part of COLTC display and it was great.
My part of the COLTC NMRA LEGO Display 2005
This may not be totally LEGO legal, but hey it works. And even after all most a year of being built I could find no damage to my bricks. SO make these types of designs at your own risk, I take no responsibility if you stress your bricks too far and damage them.
LEGO Pre-Stressed Bridge v7