The possible structure of benzene occurred in a dream to the great chemist Kekule. In his dreams Kekule saw the snake dying on his tail and from that idea he came up with a ring structure of 6 carbon atoms. Today we do not need to see this structure in dreams.
The advances of the technique allow us to see it live. In the image of the IBM Research Center, located in San Jose, California, you can see the image of benzene obtained by electronic tunnel microscope effect.