pixabay and wikimedia.
It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
This image was acquired from
Keywords from Image Description:
caves postojna stalactites Brilliant in Postojna Cave. Brilliant in Postojna Cave Toyah confirmed GRuban files for migration Brilliant stalagmite
Page 2023 Free-images.com. All images are Public Domain