Recently I was introduced to a bridge building program, Bridge It. This program is made by NVIDIA and Auran. In the game, you are given scenarios and have to make a bridge that will support the required load while staying within a budget. Let me tell you, some of them are not easy.
Bridge It lets you build these bridges from a variety of materials, including suspension cables. The bridges are tested by a car or train, and sometimes by an earthquake. Needless to say, since Bridge It is made in part by NVIDIA the graphics are sweet. Very visually stunning as it says.The game does cost $20 (if you buy it from http://www.chroniclogic.com/ otherwise it is more). It does have a free demo though. I would say it is worth the money.
You must have a NVIDIA graphics card. If you don’t know what that means, then find out. The game will not work if you have a ATI video card. Ask any computer geek you know and he will be able to tell you what you have.