John describes how heaven looks like in Revelation 4:1-11. He saw the throne of God and he describes what he saw. He saw the street of gold and the tree of life. You can imagine how beautiful the street will be if it was made of gold. Bible didn't describe how heaven look like in full detail. God want it to be a surprise for us that is why it we were not given the full details.
1 Corinthians 2:9 But as it is written, Eye hath not seen, nor ear heard, neither have entered into the heart of man, the things which God hath prepared for them that love him.
