one thing Ive always wanted to see in the civ games are canals. a worker action that allows ships to pass through squares of land. now we couldnt just go around making canals everywhere, so they would have to be lmited, a canal may be built on a land space which is next to water. Think of it, cities that are one space away from the oceans would then have ship producing capabilities. On continents, if there is a thin section of land (2 tiles or less)seperating 2 oceans, you could make a canal from each ocean and connect them, making a pathway without having to travel the world to get your ships to a that other ocean. they shouldnt be easy to build either, maybe as many turns as a fortress, and couldnt come out until probably the industrial revolution. maybe even make a wonder . . . panama canal? food for thought