This is what 1 tonne (2204 LBS) of gold looks like -
http://demonocracy.info/infographics/world/gold/images/demon...
https://www.wolframalpha.com/input/?i=1+tonne+of+gold+in+cub...
A gallon of gold is 75lbs, almost 10x as dense as water, and worth about $3million