Human cells
The human body has tens of trillions of body cells. I once told a microbiologist that I had heard that the inside of a body cell had a infrastructure as complicated as the infrastructure of London or New York.
He replied saying that it was at least 
that complicated. He did not accept the fairy tale of evolution. He was a professor. People tried to get him fired because he did not believe in the fairy tale. Watch this video about the inside of a body cell: https://www.youtube.com/watch?v=FzcTgrxMzZk.
