A plan of the ancient Greek city of Olympia, the religious site (with an important temple to Zeus) where the original Olympics took place. A high quality .jpg, 600 dpi, and at least 10" x 10" in size, which makes it suitable for printing as well as projecting (unlike many images available on the net).
All images carry the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. That means that, upon the purchase of these images, you are free to share them, i.e. copy and redistribute the material in any medium or format or adapt them, i.e. remix, transform, and build upon them. But this sharing and adapting cannot be applied to any commercial use of the images.
For more information about the license, see this link: https://creativecommons.org/licenses/by-nc-sa/4.0/ (and this link, if you dare, for the full, legalese version: https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode).
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