Naval Yard

The Dreadnought race of the early twentieth century — Britain versus Germany, turret for turret, displacement for displacement — defined a generation of strategic anxiety and produced the most devastating surface combatants the world has ever seen. The Naval Yard builds those behemoths: battleships displacing tens of thousands of tons, bristling with heavy caliber guns, capable of projecting power across entire ocean theatres. A single salvo from a battleship's main battery can destroy fortified coastal positions that no land army could breach. They are slow to build and expensive to maintain, but a battle-line of three or four battleships commands every sea it enters. Invest in the Naval Yard only when your economy is fully industrialized — then commit fully, because naval supremacy in the Modern Age is absolute: you have it, or you don't.