BBC:

An American academic is creating a searchable database of 12 million historic copyright-free images.

Kalev Leetaru has already uploaded 2.6 million pictures to Flickr, which are searchable thanks to tags that have been automatically added.

The photos and drawings are sourced from more than 600 million library book pages scanned in by the Internet Archive organisation.

Do not go to the linked Flickr page unless you have a lot of time on your hands. I just lost an hour of my life to it.