In Oklahoma City, Oklahoma, the Crystal Bridge Conservatory is the focus of the Myriad Botanical Gardens. Engineers designed a cloud-making system to provide the necessary environment for a rainforest. A path next to a 35-foot waterfall leads up a "mountain" of rock formations, which are really latex molds from actual rock outcroppings. The conservatory is made from over 3,000 acrylic panels. It is seven stories tall and 224 feet long.

(Photo courtesy of www.ellensplace.net)

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