Building of the Ancient era
Quick - Regular - Epic - Marathon
The Floating Gardens is a building unique to the Aztecs, replacing the watermill. The city must border fresh water (not just a river). The Floating Gardens provides 15% increase in food, and +2 food per lake tile worked, rather than a flat +2 food, and requires 1 less gold to maintain than the watermill it replaces. Overall, it provides a great kick for your food production. The Aztec player should try building their cities in the right places (on rivers, or near lakes), so that they could use the benefits of the Floating Gardens to their maximum.
A floating garden is a small artificial island constructed on a freshwater lake in order to increase the land available for agriculture. The lake irrigates the island and provides it with fresh organic material, resulting in an incredibly fertile growing environment. The Aztecs were masters of this form of agriculture, and the "Floating Gardens of Xochimilco" remain famous today.