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
That wouldn't be crossing. Crossing is when you focus your eyes in front of the image. Wall-eyed is where you unfocus your eyes behind the image. Trying to look at your nose is crossing. The way you look at most magic eye images is wall-eyed.