how to close 100 finder windows at once?

[LeandrodaFL]

Lets say that I have 100 finder windows open, its gonna be really boring to close them all individually, and I cant quit the application on the dock. How do I close them all at once? is there a shortcut?

 

[simsaladimbamba]

Cmd+Option+W. That shortcut also works in other applications.

 

[mooblie]

Also:
alt+click on any one of the red "close" buttons (at top left of title bar of any Finder window).

Amounts to the same thing, really.