The World Trade Centers, or the Twin towers. They were the tallest buildings in the world, and were attacked and destroyed on 9/11 (2001) I personally do not believe it was an inside job, (or conspiracy as people call it) but it was definetly a sad event, around 3000 people died.

We did not do the insides, we are planning to.
We are also making one of the plane's that hit the buildings.

Rest in peace, all of those who died in this tragedy.