Complimentary admission for four to the Rosine Smith Sammons Butterfly House and Insectarium.  Located at historic Fair Park in Dallas, Texas Discovery Gardens is a year-round organic urban oasis filled with natural wonders for visitors of all ages. Our 7.5 acres includes the brand new Rosine Smith Sammons Butterfly House and Insectarium. Meander down our canopy walkway as you see hundreds of free-flying tropical butterflies and our collection of tropical plants. Texas Discovery Gardens is a non-profit educational organization supported, in part, by the Dallas Park and Recreation Department.