Horniman Museum and Gardens
This eclectic museum in Forest Hill ostensibly covers natural history - the kids will love the musical instruments, aquarium, and famous overstuffed walrus. The huge gardens and animal walk are free, making it ideal for a low-cost family picnic with London skyline views. There is a fee to enter the aquarium and butterfly house.
Times change seasonally — always check before you set off.
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V&A Museum (South Kensington)
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Wellcome Collection
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