[mjwalshe]

They did in the 1920's the first ever car bomb (a horse drawn cart) was used against the NY stock exchange. I belive you can still see the shrapnel scars on the buildings facade.

[jarek]

Can you quickly recount what has changed in lower Manhattan since the 1920s?

[mjwalshe]

The history of NYC is not my strong point I surgest a trip to a library.

You could look at

http://en.wikipedia.org/wiki/Wall_Street_bombing