Minecraft wiki entry for Building_a_metropolis, associated text: Since a metropolis should be quite large, efficient transportation is important to keep the city together. Public transportation hubs can create efficient travel. Some cities might work best with ice roads, minecart rails, or piston bolts. Some might work best using the Nether to decrease the travel time and distance. Command blocks can be programmed to teleport players when triggered. Infrastructure fitting to the theme of the metropolis should also be used to give more life to the city.