Dig Down the Mountain, Fill Up the Ocean.

This mod adds a series of unique units and improvements, which provide the ability for player to removes mountains and ocean. What this Mod adds: Yu Gong: Unique ancient unit, unlock with Masonry. Can build the Stoneworks improvement, which can only be placed in a mountain that is not a volcano. Once built, the plot under this improvement will become a hill plot, and this improvement will be removed immediately. Yu Gong can be used only 1 time, but gets 1 extra charge after researching Nuclear Fission. Jing Wei: Unique classical unit, unlock with Ship Building. Can build the Pebble Stacks improvement, which can only be placed in a Coast or Lake tile that has no resources on it. Once built, the plot under this improvement will become a plain plot, and this improvement will be removed immediately. Jing Wei can be used only 1 time, but cities that have the Temple building get 50% production bonus towards it. Tian Kun Hao: Unique future unit, unlock with Seasteads. Can build the Artificial Island improvement, which can only be placed in a Coast or Lake or Ocean tile that has no resources on it. Once built, the plot under this improvement will become a plain plot, and this improvement will be removed immediately. Tian Kun Hao can be used 2 times, it is 30% cheaper to purchase with Gold if the city has the Seaport building. Warning: Because of the CIV6's own problem, after transform the terrain, the data side of the terrain will be fine, but the visual side of the terrain will remain the same(means after you turn a mountain to a hill, it will still looks like a mountain, although it is function like a hill.). For this problem, please save and reload the game, after reloading, the visual should be fixed.