Online Travel Booking and Bidding Agencies - Europe > US

I was wondering if there's an aggregator that will search from various EU cities or the continent itself to one destination, i.e. the reverse search of Kayak/Buzz that gives one the option of searching from one originating city to a whole continent.

I wasn't able to find the answer going thru my ITA-Route-Language info.

Anyone out there with help ?

Thanks in advance !