The name may conjure up images of Disney's hippos in tutus, but it's smaller critters that feature in this glass pyramid, parked between the depressingly shabby Parc Tawe Shopping Centre and the river. Plantasia contains hundreds of species of exotic plants, plus attendant insects, reptiles, snakes, tropical fish (including piranhas), birds and tamarin monkeys. A coffee shop and range of kids' activities make it a popular rainy-day retreat.