I found this Oda Nobunaga link earlier today while looking for Nanbanji photos. The link is sublime and it does have photos of Nanbanji which is located in Kyoto.
The main site oumi-castle is one of the best I have seen in a long time. There are several prefectures you can check out for historical landmarks related to Sengoku history. I have posted their link on the link page. Check it out.
They also have links to books and other memorabilia related to the Sengoku Era.
Tenka no tame!