During the times of the ancient Roman empire, when they would hold gladiator matches and things, they would also have mock sea battles. They would fill a stone arena aaall the way up with water, and then actually put several large ships in there, which would float and sail, like in a seaglobe. And the slaves on these ships would have battles for people's entertainment. They DIED, since you can't fake dying under those sort of circumstances, but I just thought that was wildly interesting that they would put in small oceans practically. I wish there were drawings of that.
Just thought that was interesting and worth sharing. :D