The following photos are from Flickr and are licensed under creative commons (the last time I checked) which can be used for commercial purposes (please double check before using).
Photo of Manhattan by aturkus
Photo of Mt. Shucksan by papalars
Photo by buckyishungry
Photo of Empire State Building by epicharmus
Photo of Iraq by The US Army
Photo by martin_vmorris from Flickr
Arc de Triomphe by Jiuguang Wang from Flickr
Photo of Hogwarts at Universal Studios by Charles Sipe