Here is a picture of Prophet Ibrahim (PBUH) footprint near the Kaabah
Is there any evidence that is definitely footprint of Prophet Ibrahim (PBUH)?
I am unable to validate the authenticity of this picture. However, it has been reported by the sahabi Anas ibn Malik that the prophet Ibrahim's footprints had already been worn out (from people touching it) in his time. This was 1400 years ago, so I doubt that there are any of the original markings left in this day and age.
Ayah Al Baqarah 125 says that the foot print is Ibrahim alai's
And [mention] when We made the House a place of return for the people and [a place of] security. And take, [O believers], from the standing place of Abraham a place of prayer. And We charged Abraham and Ishmael, [saying], "Purify My House for those who perform Tawaf and those who are staying [there] for worship and those who bow and prostrate [in prayer]."
There is simple ideology of human that they make their houses according to thier height . It is written in different books that Adam was 90 feet. With the passage of time Allah reduce the height of human. If you go indepth wisdom and compare height with Adam and Ibrahim. Ibrahim might be shorter but taller than Current human. There are some reason that he might be 30 or 40 feet high: 1. Height of kaba (human make building according to height). 2. Door of kaba (normally door are made by their body size or shorter than their own size) 3. Every year traveling from Palestine to Mecca.