I have a few ideas for national projects
Mars Colony: Show your nations power and colonize Mars, has no effect on your gameplay
would require Missile launch pad, Space Program, Moon Landing, Green Technologies and Mass Irrigation
Would Cost: 10,000 Oil. 100,000 Gasoline, 1,000 Aluminum, 1,000,000 Food and $1,000,000,000
Olympic Stadium: Would Increases profit from stadiums and allow an additional stadium in each city
Would Require 10 cities
Would Cost 1,000 Steel, 500 aluminum, $15,000,000
National Granary: Triple farm production but increases upkeep
Requires: Mass Irrigation
Would Cost: 250 Steel, 500 gasoline, $10,000,000