Franklin Park Conservatory opened in 1895 as part of the city beautiful movement. It was inspired by World's Fair designs and includes 88 acres of public park with gardens, a lake, paths, and of course the beautiful greenhouse! Step inside and you'll forget it still feels like winter outside... in fact, you might want to check your coat at the door because you'll be down right hot!
As someone with their own butterfly garden, I could have stayed for hours in the Blooms and Butterflies exhibit! (I also never wanted to leave after being in the warm humidity again.) We stayed long enough to hear about some of the species they collect for the exhibit and saw the twice-daily release of more butterflies (recently escaped from cocoon status). I think butterflies are just so interesting in general... changing from a mere bug crawling slowly on the ground to a beautiful butterfly that can fly many miles.