The city of Helsinki, Finland has put over 65K historical images under Creative Commons

The city of Helsinki, Finland has unveiled a collection of more than 65,000 historical images captured in and around the city that are now free to download and use however you see fit. You can also order prints directly from the site if you wish to support the collection directly.

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https://www.dpreview.com/news/4163142919/the-city-of-helsinki-finland-has-put-over-65k-historical-images-under-creative-commons