As an example, you can now place Mount Everest in your town (these Wonders are only available to place in your Main City and not Downtown). However, you can't actually place any of these Wonders without collecting a few Gems first. These Gems come in the form of Sapphires, Pearls, Emeralds, Rubies, Alexandrite and Diamonds. You'll earn them by either posting a general news feed request on your wall or by collecting Gems that appear at random when collecting from "Natural Wonder" buildings that are available to purchase in the store.
Each Natural Wonder can be placed after completing its Level 1 Gem requirement, and can then be upgraded all of the way to Level 6. In the case of Mount Everest, you'll need to collect items like Emeralds, Sapphires and Pearls before you can upgrade to Level 2, but the requirements for each level will become more demanding and varied along the way. When you reach Level 6 of Mount Everest, you'll receive 100 energy points as a reward, and will receive a 100% boost on the payout of community buildings.
All other Natural Wonders follow the same template for building, but you can only start the construction of each Wonder once per day. Personally, I'd suggest completely finishing a single Natural Wonder before starting any others, just so your town isn't full of unfinished projects that all require the same items. It's definitely possible that additional Natural Wonders will be released in CityVille before all is said and done, and if that's the case, we'll make sure to let you know.
[Via and image credit: Zynga]
What do you think of these first few Natural Wonders in CityVille? Will you try to build them all, or are they too large to hold in your current city? Sound off in the comments!