Adam was about 60 feet tall. Is this a religious belief or is it a fictional story?

I saw the foot of prophet Araham in Kaba when he was standing on a stone to build it , it is a foot of a giant , that proves early people were taller than us . There is one hadith says that Adam was 60 feet also and we will be that hight in Janna , the hadith is in Bukhari , only God knows if this is true or not.