Two separate mods, get them from the mod browser. The Registan: +2 gold from merchant specialists in every city and a free observatory. Requires plains. Global Seed Vault: +2 population in all cities and +2 food for scientist specialists. Requires tundra and a mountain nearby. Also changes the CN Tower: +100% gold in this city and -50% unhappiness from number of cities. Cannot be built in the capital. Art by Sneaks. These wonders originally come from the BMF mod. Some other stuff from the same mod will find its way to G+K in the near future.