Googled "photos Bible landmarks" Have you seen this? Bible Places. Interesting potential for walking tours. Take the places Elisha walked and find them on the left sidebar.
Then there's Bible Walks. Find the location on the map. Point and click for a photo.
More photos from Biblical sites at Sacred Destinations.
And check out Shutterstock.com
I'm sure there's more . . . check the copyrights, permissions and such ... I don't know if there are sources/software that will give churches permission to use the photos over and over within their church like they do song overheads especially if people are using Power Point more for Christian Education/Christian Formation & worship.
The obvious drawback is that kids are looking at ruins instead of a picture of the outside where they can imagine actually being there. Something to play with.