The goal it to make you to feel like you are standing there soaking in the scene.
There are 2 challenges to making this happen.
The first is to take a picture that has the clarity to produce a large print. When practicing began in 2001, I was taking landscape photographs morning and night and learning Photoshop during the day. As the Photoshop skills improved, a thought struck that the scene being shot could be captured by zooming in and taking multiple rows of pictures, then stitching them together. This technique would give a higher resolution image, which is what was needed to print a large image.This shot at Grand Canyon was the first large project. There are 35 individual pictures that are carefully stitched into a composite, the stitching took around 60 hours to complete.
The second challenge is printing. The first print of the above photo was horrible. It took six months of Photoshop practice and understanding how large format printers work to get an acceptable result. The first large print was sold in 2003.