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Mega Buildings

Al Burj: +5 gold per Policy. No Requirements to build.

Bionic Tower: Adds +8 Culture, +8 Gold, and +4 Production to nearby seaplots, and 3 free fishing boats in the city it was built. Requires a nearby Ocean.

Buenos Aires Forum: Reduces purchasing costs of plots by 25%, reduces costs of upgrading units by 50%, increases golden age length by 40%, and starts a golden age. Requires a nearby River

Floating Islands: +50 Food, +10 Production, and +5 Happiness. Requires a nearby Ocean.

Kingdom Tower: +75 Culture, +10 Gold, and 1 free Great Prophet in the city it was built. No Requirements to build.

Miapolis: +5 Free Great Merchants, + 15 Gold, and +15 Culture in the city it was built in. Requires a nearby Ocean.

Shimizu Mega City Pyramid: +20 Gold, +20 Food, +20 Culture, +20 Production, +10 Happiness, and 1 Free Great Artist in the city it was built in. Requires a nearby Ocean.

Sky City: +5 population per city and + 20 Happiness. No Requirements to build.

Ultima Tower: +5 Free Social Policies and + 30 Gold in the city it was built in. No Requirements to build.

This mod requires Gods and Kings.

If you have Gods & Kings and don't know how to download or activate this mod, please follow this step-by-step guide here: http://forums.civfanatics.com/showthread.php?t=465972
If the step-by-step guide still never fixed your problem it's a common cache issue, which can be fixed by these steps:

1) Unsubscribe from the mod. Exit Steam and Civ 5 completely
2) Empty your mod folder : C:\Documents and Settings\[YOUR USERNAME]\My documents\My Games\Sid Meier's Civilization 5\MODS
3) Delete the "Civ5ModsDatabase.db" file located at: C:\Documents and Settings\[YOUR USERNAME]\My documents\My Games\Sid Meier's Civilization 5\cache
4) Restart steam, subscribe, restart Civ 5.