When viewed in a particular way, these images will appear three-dimensional. The trick is to squint your eyes so that two adjacent images overlay each other in the visual field.
The leftmost image of each triplet is for the left eye, and the center image is for the right eye. The left eye image is reproduced on the right to allow for both parallel and cross-eyed viewing (LRL stereogram). Use whichever pair you prefer.
I've taken these photos using a phone camera.