The Myriad Botanical Gardens, Oklahoma City’s acclaimed botanical facility, features an enclosed tropical conservatory, the Crystal Bridge Tropical Conservatory, built over a two-acre lake surrounded by 17 acres of outdoor grounds. The Crystal Bridge Tropical Conservatory contains thousands of plants from around the world. Endangered palm trees, begonias and over 1,500 orchids are featured in the 224-foot long glass structure. Look for the yellow and black zebra longwing butterflies and free roaming amphibians that constitute the conservatories wildlife. Admission fee. Stop by and check out Project Amazonia: Brazil Explored. From March 10-November 1, visitors can leap into the Myriad Botanical Gardens first-ever Amazonian rainforest display! Nestled deep within the river valleys of Brazil is a mystifying, tropical paradise that is sure to please both adults and children alike.