A number of online public domain and stock photo websites have free images of English Castles, including Wikimedia, Flickr, Publicdomainpictures.net and Freeimages.com. In addition to free photos, some of these websites have pictures available for purchase.
Free stock photos on these and other websites have different levels of copyright protection, ranging from public domain photos that can be used for any purpose to creative commons photos restricted to personal or non-commercial use. Most websites provide copyright and use information on individual photo pages. Flickr provides an advanced search tool that allows users to limit search results to images with a creative commons license, as well as to images allowed for commercial use.