Disclaimer: I'm an absolutely shameless tourist (the one who takes a million pictures, with a few angles of each) and while visiting Pittsburgh, this was at the top of my list!
At first sight, the conservatory does not look that big but I spent over an hour inside. All of the rooms have their own theme and character.. I loved reading through all the different kinds of plants they had and where they were from. The Butterfly Room was open while I was visiting and that was such a cute experience.
I would definitely recommend this is you want a fun little family activity or are just really fascinated with nature like I am. :)