Coloured postcard of the flower garden in the Royal Botanic Society's Gardens in Regent's Park. Regent's Park was originally intended to be the grounds of an estate created by John Nash for the Prince Regent, but by the time work was underway the Prince Regent had taken Buckingham House as his residence. Regent's Park was opened to the public in the 1830s. The inner circle was from 1840 to 1930 the site of the Royal Botanic Society's garden, designed by Robert Marnock; after that society folded, it was developed by Duncan Campbell as Queen Mary's Rose Garden. At the north end of the park is the London Zoo, laid out by Decimus Burton for the Zoological Society of London in the 1820s, and opened to the public in 1847