If you haven't seen these pictures yet, they are absolutely worth a look. The story behind the photographer and his technique are fascinating, as are the images. Hard to believe they were taken over 100 years ago. Stunning Images.
On a side note, one little known rule about copyrights, at least in the US, they become "Public Domain
" 70 years after the death of the creator. There are some rules on how this works, but for the most part, 70 years is the general rule. (List of Copyright Expirations by Country