My time has come!
The above stereographic image is for cross-eyed viewing (most stereograms are wall-eyed, so you may need to put your finger in front of your screen until this one comes into focus)
This is an image of Honolulu, Hawaii, published by NASA. Note Diamond Head (the volcanic crater) in the south.
Here are some other stereopairs published by JPL:
Wheeler Ridge, California
Mount Saint Helens
Salt Lake Valley, Utah
Wellington, New Zealand
I tried so long I tried every method, never worked for me. Then eventually I found an image that made it work for me
https://i.redd.it/25c330mmohu51.jpg
(Sorry for the Reddit link). How I do it: put your phone screen right before your nose and unfocus your eyes. Then, don't move your eyes, don't move your focus, but slowly move the phone away from your face. At about 10-20cm distance, you should be able to see a squirrel with a nut in its hands.
After that it became very easy to do other pictures simply by knowing what to expect (an actual 3d image).
That being said the one above is really hard.