The Hyde Park pet cemetery, established in the 1880s, is a quirky burial ground for beloved pets located in London. Initially started by a park keeper who buried his own dog, it gained popularity after a royal dog was laid to rest there. With around 1,000 burials, including cats, monkeys, and birds, this hidden gem is now maintained as a heritage site by The Royal Parks. Although off-limits to the public due to vandalism risks, occasional tours are offered for curious visitors to explore this unique and historic resting place for furry friends.