Contrary to popular belief, the answer is Richmond Park, not Hyde Park. Richmond Park is the largest of London's eight Royal Parks and is the biggest enclosed space in London. Richmond Park's royal connections go back a long way to Henry VIII, who was the first to call it Richmond, and before that, to Edward (1272-1307). During the plague in 1625, Charles I decamped from the claustrophobic infection center to the clean air of Richmond. Find out everything you need for a visit to Richmond Park on the Royal Parks website.