Tropical World, located in Roundhay Park is a simulated rainforest walkaround. It's home to many exotic animals, including spiders, frogs, butterflies, aquatic life and the famous meerkats.
It's been around for a long time, at least since I was little. I remember going all the time as a kid (mainly to get a stuffed animal from the gift shop) and I enjoyed it. The butterfly house was humid and had that faint smell of damp and occasionally you would see a spec of green, blue or orange from one of the insects.
It was always quite a fun time, and probably still is for children. However, recently LeedsLive reported that a visitor took her friend from the US to the Tropical World and she came away disappointed and "embarrased" at what it had become.