Where can I find royalty-free NY pictures?

[gaetanomarano]

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I've made and published on my website (http://www.gaetanomarano.it/) five different original PC desktop wallpapers about the Segway (like the "Segway on the Moon (http://www.gaetanomarano.it/segway/segway.html)").

Now I wish to make another Segway desktop wallpaper with a NY background, not with the skyscrapers, but with the most antique and classic buildings and their streets.

Can you say me where I can find good royalty-free hi-res color images of them?

Thanks.

Gaetano