Sure, the London Aquarium is ever so big and has a shark pool, but good things also come in smaller packages. The Horniman’s more modest space can take you on an equally magical journey to the big guns, transporting you through the rivers and oceans of the world, from British ponds to Fijian coral reefs.

Horniman Museum. Forest Hill Overground. Museum entry free. Aquarium £6, £3 children.